diff --git a/lib/LocalizedStrings.js b/lib/LocalizedStrings.js
index 8f06a22..6310349 100644
--- a/lib/LocalizedStrings.js
+++ b/lib/LocalizedStrings.js
@@ -10,9 +10,9 @@
  * then display the correct language strings or the default language (the first
  * one if a match is not found).
  *
- * This library has been refactored to use the newly created localized-strings package so to 
+ * This library has been refactored to use the newly created localized-strings package so to
  * unify the code and make it easier to mantain
- * 
+ *
  * How to use:
  * Check the instructions at:
  * https://github.com/stefalda/react-localization
@@ -49,7 +49,7 @@ var placeholderRegex = /(\{[\d|\w]+\})/;
  * eg. 1: strings.formatString(strings.question, strings.bread, strings.butter)
  * eg. 2: strings.formatString(strings.question, { bread: strings.bread, butter: strings.butter }
  *
- * THIS METHOD OVERRIDE the one of the parent class by adding support for JSX code      
+ * THIS METHOD OVERRIDE the one of the parent class by adding support for JSX code
 */
 _localizedStrings2.default.prototype.formatString = function (str) {
   for (var _len = arguments.length, valuesForPlaceholders = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
@@ -57,7 +57,7 @@ _localizedStrings2.default.prototype.formatString = function (str) {
   }
 
   var hasObject = false;
-  var res = str.split(placeholderRegex).filter(function (textPart) {
+  var res = (str || '').split(placeholderRegex).filter(function (textPart) {
     return !!textPart;
   }).map(function (textPart, index) {
     if (textPart.match(placeholderRegex)) {
diff --git a/package-lock.json b/package-lock.json
index 8bb2d7e..4783b0c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -23,8 +23,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "arrify": "^1.0.0",
-        "micromatch": "^2.1.5"
+        "arrify": "1.0.1",
+        "micromatch": "2.3.11"
       }
     },
     "arr-diff": {
@@ -34,7 +34,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "arr-flatten": "^1.0.1"
+        "arr-flatten": "1.1.0"
       }
     },
     "arr-flatten": {
@@ -76,21 +76,21 @@
       "integrity": "sha1-IHzXBbumFImy6kG1MSNBz2rKIoM=",
       "dev": true,
       "requires": {
-        "babel-core": "^6.24.1",
-        "babel-polyfill": "^6.23.0",
-        "babel-register": "^6.24.1",
-        "babel-runtime": "^6.22.0",
-        "chokidar": "^1.6.1",
-        "commander": "^2.8.1",
-        "convert-source-map": "^1.1.0",
-        "fs-readdir-recursive": "^1.0.0",
-        "glob": "^7.0.0",
-        "lodash": "^4.2.0",
-        "output-file-sync": "^1.1.0",
-        "path-is-absolute": "^1.0.0",
-        "slash": "^1.0.0",
-        "source-map": "^0.5.0",
-        "v8flags": "^2.0.10"
+        "babel-core": "6.25.0",
+        "babel-polyfill": "6.23.0",
+        "babel-register": "6.24.1",
+        "babel-runtime": "6.23.0",
+        "chokidar": "1.7.0",
+        "commander": "2.11.0",
+        "convert-source-map": "1.5.0",
+        "fs-readdir-recursive": "1.0.0",
+        "glob": "7.1.2",
+        "lodash": "4.17.4",
+        "output-file-sync": "1.1.2",
+        "path-is-absolute": "1.0.1",
+        "slash": "1.0.0",
+        "source-map": "0.5.6",
+        "v8flags": "2.1.1"
       }
     },
     "babel-code-frame": {
@@ -99,9 +99,9 @@
       "integrity": "sha1-AnYgvuVnqIwyVhV05/0IAdMxGOQ=",
       "dev": true,
       "requires": {
-        "chalk": "^1.1.0",
-        "esutils": "^2.0.2",
-        "js-tokens": "^3.0.0"
+        "chalk": "1.1.3",
+        "esutils": "2.0.2",
+        "js-tokens": "3.0.2"
       }
     },
     "babel-core": {
@@ -110,25 +110,25 @@
       "integrity": "sha1-fdQrBGPHQunVKW3rPsZ6kyLa1yk=",
       "dev": true,
       "requires": {
-        "babel-code-frame": "^6.22.0",
-        "babel-generator": "^6.25.0",
-        "babel-helpers": "^6.24.1",
-        "babel-messages": "^6.23.0",
-        "babel-register": "^6.24.1",
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.25.0",
-        "babel-traverse": "^6.25.0",
-        "babel-types": "^6.25.0",
-        "babylon": "^6.17.2",
-        "convert-source-map": "^1.1.0",
-        "debug": "^2.1.1",
-        "json5": "^0.5.0",
-        "lodash": "^4.2.0",
-        "minimatch": "^3.0.2",
-        "path-is-absolute": "^1.0.0",
-        "private": "^0.1.6",
-        "slash": "^1.0.0",
-        "source-map": "^0.5.0"
+        "babel-code-frame": "6.22.0",
+        "babel-generator": "6.25.0",
+        "babel-helpers": "6.24.1",
+        "babel-messages": "6.23.0",
+        "babel-register": "6.24.1",
+        "babel-runtime": "6.23.0",
+        "babel-template": "6.25.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0",
+        "babylon": "6.17.4",
+        "convert-source-map": "1.5.0",
+        "debug": "2.6.8",
+        "json5": "0.5.1",
+        "lodash": "4.17.4",
+        "minimatch": "3.0.4",
+        "path-is-absolute": "1.0.1",
+        "private": "0.1.7",
+        "slash": "1.0.0",
+        "source-map": "0.5.6"
       }
     },
     "babel-generator": {
@@ -137,14 +137,14 @@
       "integrity": "sha1-M6GvcNXyiQrrRlpKd5PB32qeqfw=",
       "dev": true,
       "requires": {
-        "babel-messages": "^6.23.0",
-        "babel-runtime": "^6.22.0",
-        "babel-types": "^6.25.0",
-        "detect-indent": "^4.0.0",
-        "jsesc": "^1.3.0",
-        "lodash": "^4.2.0",
-        "source-map": "^0.5.0",
-        "trim-right": "^1.0.1"
+        "babel-messages": "6.23.0",
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0",
+        "detect-indent": "4.0.0",
+        "jsesc": "1.3.0",
+        "lodash": "4.17.4",
+        "source-map": "0.5.6",
+        "trim-right": "1.0.1"
       }
     },
     "babel-helper-bindify-decorators": {
@@ -153,9 +153,9 @@
       "integrity": "sha1-FMGeXxQte0fxmlJDHlKxzLxAozA=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-traverse": "^6.24.1",
-        "babel-types": "^6.24.1"
+        "babel-runtime": "6.23.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-builder-binary-assignment-operator-visitor": {
@@ -164,9 +164,9 @@
       "integrity": "sha1-zORReto1b0IgvK6KAsKzRvmlZmQ=",
       "dev": true,
       "requires": {
-        "babel-helper-explode-assignable-expression": "^6.24.1",
-        "babel-runtime": "^6.22.0",
-        "babel-types": "^6.24.1"
+        "babel-helper-explode-assignable-expression": "6.24.1",
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-builder-react-jsx": {
@@ -175,9 +175,9 @@
       "integrity": "sha1-CteRfjPI11HmRtrKTnfMGTd9LLw=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-types": "^6.24.1",
-        "esutils": "^2.0.0"
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0",
+        "esutils": "2.0.2"
       }
     },
     "babel-helper-call-delegate": {
@@ -186,10 +186,10 @@
       "integrity": "sha1-7Oaqzdx25Bw0YfiL/Fdb0Nqi340=",
       "dev": true,
       "requires": {
-        "babel-helper-hoist-variables": "^6.24.1",
-        "babel-runtime": "^6.22.0",
-        "babel-traverse": "^6.24.1",
-        "babel-types": "^6.24.1"
+        "babel-helper-hoist-variables": "6.24.1",
+        "babel-runtime": "6.23.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-define-map": {
@@ -198,10 +198,10 @@
       "integrity": "sha1-epdH8ljYlH0y1RX2qhx70CIEoIA=",
       "dev": true,
       "requires": {
-        "babel-helper-function-name": "^6.24.1",
-        "babel-runtime": "^6.22.0",
-        "babel-types": "^6.24.1",
-        "lodash": "^4.2.0"
+        "babel-helper-function-name": "6.24.1",
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0",
+        "lodash": "4.17.4"
       }
     },
     "babel-helper-explode-assignable-expression": {
@@ -210,9 +210,9 @@
       "integrity": "sha1-8luCz33BBDPFX3BZLVdGQArCLKo=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-traverse": "^6.24.1",
-        "babel-types": "^6.24.1"
+        "babel-runtime": "6.23.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-explode-class": {
@@ -221,10 +221,10 @@
       "integrity": "sha1-fcKjkQ3uAHBW4eMdZAztPVTqqes=",
       "dev": true,
       "requires": {
-        "babel-helper-bindify-decorators": "^6.24.1",
-        "babel-runtime": "^6.22.0",
-        "babel-traverse": "^6.24.1",
-        "babel-types": "^6.24.1"
+        "babel-helper-bindify-decorators": "6.24.1",
+        "babel-runtime": "6.23.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-function-name": {
@@ -233,11 +233,11 @@
       "integrity": "sha1-00dbjAPtmCQqJbSDUasYOZ01gKk=",
       "dev": true,
       "requires": {
-        "babel-helper-get-function-arity": "^6.24.1",
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.24.1",
-        "babel-traverse": "^6.24.1",
-        "babel-types": "^6.24.1"
+        "babel-helper-get-function-arity": "6.24.1",
+        "babel-runtime": "6.23.0",
+        "babel-template": "6.25.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-get-function-arity": {
@@ -246,8 +246,8 @@
       "integrity": "sha1-j3eCqpNAfEHTqlCQj4mwMbG2hT0=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-types": "^6.24.1"
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-hoist-variables": {
@@ -256,8 +256,8 @@
       "integrity": "sha1-HssnaJydJVE+rbyZFKc/VAi+enY=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-types": "^6.24.1"
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-optimise-call-expression": {
@@ -266,8 +266,8 @@
       "integrity": "sha1-96E0J7qfc/j0+pk8VKl4gtEkQlc=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-types": "^6.24.1"
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-regex": {
@@ -276,9 +276,9 @@
       "integrity": "sha1-024i+rEAjXnYhkjjIRaGgShFbOg=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-types": "^6.24.1",
-        "lodash": "^4.2.0"
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0",
+        "lodash": "4.17.4"
       }
     },
     "babel-helper-remap-async-to-generator": {
@@ -287,11 +287,11 @@
       "integrity": "sha1-XsWBgnrXI/7N04HxySg5BnbkVRs=",
       "dev": true,
       "requires": {
-        "babel-helper-function-name": "^6.24.1",
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.24.1",
-        "babel-traverse": "^6.24.1",
-        "babel-types": "^6.24.1"
+        "babel-helper-function-name": "6.24.1",
+        "babel-runtime": "6.23.0",
+        "babel-template": "6.25.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helper-replace-supers": {
@@ -300,12 +300,12 @@
       "integrity": "sha1-v22/5Dk40XNpohPKiov3S2qQqxo=",
       "dev": true,
       "requires": {
-        "babel-helper-optimise-call-expression": "^6.24.1",
-        "babel-messages": "^6.23.0",
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.24.1",
-        "babel-traverse": "^6.24.1",
-        "babel-types": "^6.24.1"
+        "babel-helper-optimise-call-expression": "6.24.1",
+        "babel-messages": "6.23.0",
+        "babel-runtime": "6.23.0",
+        "babel-template": "6.25.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-helpers": {
@@ -314,8 +314,8 @@
       "integrity": "sha1-NHHenK7DiOXIUOWX5Yom3fN2ArI=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.24.1"
+        "babel-runtime": "6.23.0",
+        "babel-template": "6.25.0"
       }
     },
     "babel-messages": {
@@ -324,7 +324,7 @@
       "integrity": "sha1-8830cDhYA1sqKVHG7F7fbGLyYw4=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0"
+        "babel-runtime": "6.23.0"
       }
     },
     "babel-plugin-check-es2015-constants": {
@@ -333,7 +333,7 @@
       "integrity": "sha1-NRV7EBQm/S/9PaP3XH0ekYNbv4o=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0"
+        "babel-runtime": "6.23.0"
       }
     },
     "babel-plugin-syntax-async-functions": {
@@ -402,9 +402,9 @@
       "integrity": "sha1-8FiQAUX9PpkHpt3yjaWfIVJYpds=",
       "dev": true,
       "requires": {
-        "babel-helper-remap-async-to-generator": "^6.24.1",
-        "babel-plugin-syntax-async-generators": "^6.5.0",
-        "babel-runtime": "^6.22.0"
+        "babel-helper-remap-async-to-generator": "6.24.1",
+        "babel-plugin-syntax-async-generators": "6.13.0",
+        "babel-runtime": "6.23.0"
       }
     },
     "babel-plugin-transform-async-to-generator": {
@@ -413,9 +413,9 @@
       "integrity": "sha1-ZTbjeK/2yx1VF6wOQOs+n8jQh2E=",
       "dev": true,
       "requires": {
-        "babel-helper-remap-async-to-generator": "^6.24.1",
-        "babel-plugin-syntax-async-functions": "^6.8.0",
-        "babel-runtime": "^6.22.0"
+        "babel-helper-remap-async-to-generator": "6.24.1",
+        "babel-plugin-syntax-async-functions": "6.13.0",
+        "babel-runtime": "6.23.0"
       }
     },
     "babel-plugin-transform-class-properties": {
@@ -424,10 +424,10 @@
       "integrity": "sha1-anl2PqYdM9NvN7YRqp3vgagbRqw=",
       "dev": true,
       "requires": {
-        "babel-helper-function-name": "^6.24.1",
-        "babel-plugin-syntax-class-properties": "^6.8.0",
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.24.1"
+        "babel-helper-function-name": "6.24.1",
+        "babel-plugin-syntax-class-properties": "6.13.0",
+        "babel-runtime": "6.23.0",
+        "babel-template": "6.25.0"
       }
     },
     "babel-plugin-transform-decorators": {
@@ -436,11 +436,11 @@
       "integrity": "sha1-eIAT2PjGtSIr33s0Q5Df13Vp4k0=",
       "dev": true,
       "requires": {
-        "babel-helper-explode-class": "^6.24.1",
-        "babel-plugin-syntax-decorators": "^6.13.0",
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.24.1",
-        "babel-types": "^6.24.1"
+        "babel-helper-explode-class": "6.24.1",
+        "babel-plugin-syntax-decorators": "6.13.0",
+        "babel-runtime": "6.23.0",
+        "babel-template": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-plugin-transform-es2015-arrow-functions": {
@@ -449,7 +449,7 @@
       "integrity": "sha1-RSaSy3EdX3ncf4XkQM5BufJE0iE=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0"
+        "babel-runtime": "6.23.0"
       }
     },
     "babel-plugin-transform-es2015-block-scoped-functions": {
@@ -458,7 +458,7 @@
       "integrity": "sha1-u8UbSflk1wy42OC5ToICRs46YUE=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0"
+        "babel-runtime": "6.23.0"
       }
     },
     "babel-plugin-transform-es2015-block-scoping": {
@@ -467,11 +467,11 @@
       "integrity": "sha1-dsKV3DpHQbFmWt/TFnIV3P8ypXY=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.24.1",
-        "babel-traverse": "^6.24.1",
-        "babel-types": "^6.24.1",
-        "lodash": "^4.2.0"
+        "babel-runtime": "6.23.0",
+        "babel-template": "6.25.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0",
+        "lodash": "4.17.4"
       }
     },
     "babel-plugin-transform-es2015-classes": {
@@ -480,15 +480,15 @@
       "integrity": "sha1-WkxYpQyclGHlZLSyo7+ryXolhNs=",
       "dev": true,
       "requires": {
-        "babel-helper-define-map": "^6.24.1",
-        "babel-helper-function-name": "^6.24.1",
-        "babel-helper-optimise-call-expression": "^6.24.1",
-        "babel-helper-replace-supers": "^6.24.1",
-        "babel-messages": "^6.23.0",
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.24.1",
-        "babel-traverse": "^6.24.1",
-        "babel-types": "^6.24.1"
+        "babel-helper-define-map": "6.24.1",
+        "babel-helper-function-name": "6.24.1",
+        "babel-helper-optimise-call-expression": "6.24.1",
+        "babel-helper-replace-supers": "6.24.1",
+        "babel-messages": "6.23.0",
+        "babel-runtime": "6.23.0",
+        "babel-template": "6.25.0",
+        "babel-traverse": "6.25.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-plugin-transform-es2015-computed-properties": {
@@ -497,8 +497,8 @@
       "integrity": "sha1-b+Ko0WiV1WNPTNmZttNICjCBWbM=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.24.1"
+        "babel-runtime": "6.23.0",
+        "babel-template": "6.25.0"
       }
     },
     "babel-plugin-transform-es2015-destructuring": {
@@ -507,7 +507,7 @@
       "integrity": "sha1-mXux8auWf2gtKwh2/jWNYOdlxW0=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0"
+        "babel-runtime": "6.23.0"
       }
     },
     "babel-plugin-transform-es2015-duplicate-keys": {
@@ -516,8 +516,8 @@
       "integrity": "sha1-c+s9MQypaePvnskcU3QabxV2Qj4=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-types": "^6.24.1"
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0"
       }
     },
     "babel-plugin-transform-es2015-for-of": {
@@ -526,7 +526,7 @@
       "integrity": "sha1-9HyVsrYT3x0+zC/bdXNiPHUkhpE=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.22.0"
+        "babel-runtime": "6.23.0"
       }
     },
     "babel-plugin-transform-es2015-function-name": {
@@ -535,9 +535,9 @@
       "integrity": "sha1-g0yJhTvDaxrw86TF26qU/Y6sqos=",
       "dev": true,
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+        "expand-range": "1.8.2",
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-        "is-binary-path": "^1.0.0",
-        "is-glob": "^2.0.0",
-        "path-is-absolute": "^1.0.0",
-        "readdirp": "^2.0.0"
+        "anymatch": "1.3.0",
+        "async-each": "1.0.1",
+        "fsevents": "1.1.2",
+        "glob-parent": "2.0.0",
+        "inherits": "2.0.3",
+        "is-binary-path": "1.0.1",
+        "is-glob": "2.0.1",
+        "path-is-absolute": "1.0.1",
+        "readdirp": "2.1.0"
       }
     },
     "commander": {
@@ -1043,7 +1043,7 @@
       "integrity": "sha1-920GQ1LN9Docts5hnE7jqUdd4gg=",
       "dev": true,
       "requires": {
-        "repeating": "^2.0.0"
+        "repeating": "2.0.1"
       }
     },
     "encoding": {
@@ -1051,7 +1051,7 @@
       "resolved": "https://registry.npmjs.org/encoding/-/encoding-0.1.12.tgz",
       "integrity": "sha1-U4tm8+5izRq1HsMjgp0flIDHS+s=",
       "requires": {
-        "iconv-lite": "~0.4.13"
+        "iconv-lite": "0.4.18"
       }
     },
     "escape-string-regexp": {
@@ -1079,7 +1079,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "is-posix-bracket": "^0.1.0"
+        "is-posix-bracket": "0.1.1"
       }
     },
     "expand-range": {
@@ -1089,7 +1089,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "fill-range": "^2.1.0"
+        "fill-range": "2.2.3"
       }
     },
     "extglob": {
@@ -1099,7 +1099,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "is-extglob": "^1.0.0"
+        "is-extglob": "1.0.0"
       }
     },
     "filename-regex": {
@@ -1116,11 +1116,11 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "is-number": "^2.1.0",
-        "isobject": "^2.0.0",
-        "randomatic": "^1.1.3",
-        "repeat-element": "^1.1.2",
-        "repeat-string": "^1.5.2"
+        "is-number": "2.1.0",
+        "isobject": "2.1.0",
+        "randomatic": "1.1.7",
+        "repeat-element": "1.1.2",
+        "repeat-string": "1.6.1"
       }
     },
     "for-in": {
@@ -1137,7 +1137,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "for-in": "^1.0.1"
+        "for-in": "1.0.2"
       }
     },
     "fs-readdir-recursive": {
@@ -1159,8 +1159,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "nan": "^2.3.0",
-        "node-pre-gyp": "^0.6.36"
+        "nan": "2.6.2",
+        "node-pre-gyp": "0.6.36"
       },
       "dependencies": {
         "abbrev": {
@@ -1280,7 +1280,7 @@
           "integrity": "sha1-Pv/DxQ4ABTH7cg6v+A8K6O8jz1k=",
           "dev": true,
           "requires": {
-            "balanced-match": "^0.4.1",
+            "balanced-match": "0.4.2",
             "concat-map": "0.0.1"
           }
         },
@@ -2170,12 +2170,12 @@
       "integrity": "sha1-wZyd+aAocC1nhhI4SmVSQExjbRU=",
       "dev": true,
       "requires": {
-        "fs.realpath": "^1.0.0",
-        "inflight": "^1.0.4",
-        "inherits": "2",
-        "minimatch": "^3.0.4",
-        "once": "^1.3.0",
-        "path-is-absolute": "^1.0.0"
+        "fs.realpath": "1.0.0",
+        "inflight": "1.0.6",
+        "inherits": "2.0.3",
+        "minimatch": "3.0.4",
+        "once": "1.4.0",
+        "path-is-absolute": "1.0.1"
       }
     },
     "glob-base": {
@@ -2185,8 +2185,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "glob-parent": "^2.0.0",
-        "is-glob": "^2.0.0"
+        "glob-parent": "2.0.0",
+        "is-glob": "2.0.1"
       }
     },
     "glob-parent": {
@@ -2195,7 +2195,7 @@
       "integrity": "sha1-gTg9ctsFT8zPUzbaqQLxgvbtuyg=",
       "dev": true,
       "requires": {
-        "is-glob": "^2.0.0"
+        "is-glob": "2.0.1"
       }
     },
     "globals": {
@@ -2216,7 +2216,7 @@
       "integrity": "sha1-NPUEnOHs3ysGSa8+8k5F7TVBbZE=",
       "dev": true,
       "requires": {
-        "ansi-regex": "^2.0.0"
+        "ansi-regex": "2.1.1"
       }
     },
     "home-or-tmp": {
@@ -2225,8 +2225,8 @@
       "integrity": "sha1-42w/LSyufXRqhX440Y1fMqeILbg=",
       "dev": true,
       "requires": {
-        "os-homedir": "^1.0.0",
-        "os-tmpdir": "^1.0.1"
+        "os-homedir": "1.0.2",
+        "os-tmpdir": "1.0.2"
       }
     },
     "iconv-lite": {
@@ -2240,8 +2240,8 @@
       "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
       "dev": true,
       "requires": {
-        "once": "^1.3.0",
-        "wrappy": "1"
+        "once": "1.4.0",
+        "wrappy": "1.0.2"
       }
     },
     "inherits": {
@@ -2256,7 +2256,7 @@
       "integrity": "sha1-nh9WrArNtr8wMwbzOL47IErmA2A=",
       "dev": true,
       "requires": {
-        "loose-envify": "^1.0.0"
+        "loose-envify": "1.3.1"
       }
     },
     "is-binary-path": {
@@ -2266,7 +2266,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "binary-extensions": "^1.0.0"
+        "binary-extensions": "1.8.0"
       }
     },
     "is-buffer": {
@@ -2289,7 +2289,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "is-primitive": "^2.0.0"
+        "is-primitive": "2.0.0"
       }
     },
     "is-extendable": {
@@ -2311,7 +2311,7 @@
       "integrity": "sha1-zGZ3aVYCvlUO8R6LSqYwU0K20Ko=",
       "dev": true,
       "requires": {
-        "number-is-nan": "^1.0.0"
+        "number-is-nan": "1.0.1"
       }
     },
     "is-glob": {
@@ -2320,7 +2320,7 @@
       "integrity": "sha1-0Jb5JqPe1WAPP9/ZEZjLCIjC2GM=",
       "dev": true,
       "requires": {
-        "is-extglob": "^1.0.0"
+        "is-extglob": "1.0.0"
       }
     },
     "is-number": {
@@ -2330,7 +2330,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "kind-of": "^3.0.2"
+        "kind-of": "3.2.2"
       }
     },
     "is-posix-bracket": {
@@ -2372,8 +2372,8 @@
       "resolved": "https://registry.npmjs.org/isomorphic-fetch/-/isomorphic-fetch-2.2.1.tgz",
       "integrity": "sha1-YRrhrPFPXoH3KVB0coGf6XM1WKk=",
       "requires": {
-        "node-fetch": "^1.0.1",
-        "whatwg-fetch": ">=0.10.0"
+        "node-fetch": "1.7.1",
+        "whatwg-fetch": "2.0.3"
       }
     },
     "jasmine": {
@@ -2382,9 +2382,9 @@
       "integrity": "sha1-jKctEC5jm4Z8ZImFbg4YqceqQrc=",
       "dev": true,
       "requires": {
-        "exit": "^0.1.2",
-        "glob": "^7.0.6",
-        "jasmine-core": "~2.99.0"
+        "exit": "0.1.2",
+        "glob": "7.1.2",
+        "jasmine-core": "2.99.1"
       },
       "dependencies": {
         "jasmine-core": {
@@ -2418,7 +2418,7 @@
       "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
       "dev": true,
       "requires": {
-        "is-buffer": "^1.1.5"
+        "is-buffer": "1.1.5"
       }
     },
     "localized-strings": {
@@ -2437,7 +2437,7 @@
       "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.3.1.tgz",
       "integrity": "sha1-0aitM/qc4OcT1l/dCsi3SNR4yEg=",
       "requires": {
-        "js-tokens": "^3.0.0"
+        "js-tokens": "3.0.2"
       }
     },
     "micromatch": {
@@ -2447,19 +2447,19 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "arr-diff": "^2.0.0",
-        "array-unique": "^0.2.1",
-        "braces": "^1.8.2",
-        "expand-brackets": "^0.1.4",
-        "extglob": "^0.3.1",
-        "filename-regex": "^2.0.0",
-        "is-extglob": "^1.0.0",
-        "is-glob": "^2.0.1",
-        "kind-of": "^3.0.2",
-        "normalize-path": "^2.0.1",
-        "object.omit": "^2.0.0",
-        "parse-glob": "^3.0.4",
-        "regex-cache": "^0.4.2"
+        "arr-diff": "2.0.0",
+        "array-unique": "0.2.1",
+        "braces": "1.8.5",
+        "expand-brackets": "0.1.5",
+        "extglob": "0.3.2",
+        "filename-regex": "2.0.1",
+        "is-extglob": "1.0.0",
+        "is-glob": "2.0.1",
+        "kind-of": "3.2.2",
+        "normalize-path": "2.1.1",
+        "object.omit": "2.0.1",
+        "parse-glob": "3.0.4",
+        "regex-cache": "0.4.3"
       }
     },
     "minimatch": {
@@ -2468,7 +2468,7 @@
       "integrity": "sha1-UWbihkV/AzBgZL5Ul+jbsMPTIIM=",
       "dev": true,
       "requires": {
-        "brace-expansion": "^1.1.7"
+        "brace-expansion": "1.1.8"
       }
     },
     "minimist": {
@@ -2504,8 +2504,8 @@
       "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-1.7.1.tgz",
       "integrity": "sha512-j8XsFGCLw79vWXkZtMSmmLaOk9z5SQ9bV/tkbZVCqvgwzrjAGq66igobLofHtF63NvMTp2WjytpsNTGKa+XRIQ==",
       "requires": {
-        "encoding": "^0.1.11",
-        "is-stream": "^1.0.1"
+        "encoding": "0.1.12",
+        "is-stream": "1.1.0"
       }
     },
     "normalize-path": {
@@ -2515,7 +2515,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "remove-trailing-separator": "^1.0.1"
+        "remove-trailing-separator": "1.0.2"
       }
     },
     "number-is-nan": {
@@ -2536,8 +2536,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "for-own": "^0.1.4",
-        "is-extendable": "^0.1.1"
+        "for-own": "0.1.5",
+        "is-extendable": "0.1.1"
       }
     },
     "once": {
@@ -2546,7 +2546,7 @@
       "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
       "dev": true,
       "requires": {
-        "wrappy": "1"
+        "wrappy": "1.0.2"
       }
     },
     "os-homedir": {
@@ -2567,9 +2567,9 @@
       "integrity": "sha1-0KM+7+YaIF+suQCS6CZZjVJFznY=",
       "dev": true,
       "requires": {
-        "graceful-fs": "^4.1.4",
-        "mkdirp": "^0.5.1",
-        "object-assign": "^4.1.0"
+        "graceful-fs": "4.1.11",
+        "mkdirp": "0.5.1",
+        "object-assign": "4.1.1"
       }
     },
     "parse-glob": {
@@ -2579,10 +2579,10 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "glob-base": "^0.3.0",
-        "is-dotfile": "^1.0.0",
-        "is-extglob": "^1.0.0",
-        "is-glob": "^2.0.0"
+        "glob-base": "0.3.0",
+        "is-dotfile": "1.0.3",
+        "is-extglob": "1.0.0",
+        "is-glob": "2.0.1"
       }
     },
     "path-is-absolute": {
@@ -2616,7 +2616,7 @@
       "resolved": "https://registry.npmjs.org/promise/-/promise-7.3.1.tgz",
       "integrity": "sha1-BktyYCsY+Q8pGSuLG8QY/9Hr078=",
       "requires": {
-        "asap": "~2.0.3"
+        "asap": "2.0.6"
       }
     },
     "randomatic": {
@@ -2626,8 +2626,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "is-number": "^3.0.0",
-        "kind-of": "^4.0.0"
+        "is-number": "3.0.0",
+        "kind-of": "4.0.0"
       },
       "dependencies": {
         "is-number": {
@@ -2637,7 +2637,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "kind-of": "^3.0.2"
+            "kind-of": "3.2.2"
           },
           "dependencies": {
             "kind-of": {
@@ -2647,7 +2647,7 @@
               "dev": true,
               "optional": true,
               "requires": {
-                "is-buffer": "^1.1.5"
+                "is-buffer": "1.1.5"
               }
             }
           }
@@ -2659,7 +2659,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "is-buffer": "^1.1.5"
+            "is-buffer": "1.1.5"
           }
         }
       }
@@ -2669,10 +2669,10 @@
       "resolved": "https://registry.npmjs.org/react/-/react-16.2.0.tgz",
       "integrity": "sha512-ZmIomM7EE1DvPEnSFAHZn9Vs9zJl5A9H7el0EGTE6ZbW9FKe/14IYAlPbC8iH25YarEQxZL+E8VW7Mi7kfQrDQ==",
       "requires": {
-        "fbjs": "^0.8.16",
-        "loose-envify": "^1.1.0",
-        "object-assign": "^4.1.1",
-        "prop-types": "^15.6.0"
+        "fbjs": "0.8.16",
+        "loose-envify": "1.3.1",
+        "object-assign": "4.1.1",
+        "prop-types": "15.6.0"
       },
       "dependencies": {
         "core-js": {
@@ -2685,13 +2685,13 @@
           "resolved": "https://registry.npmjs.org/fbjs/-/fbjs-0.8.16.tgz",
           "integrity": "sha1-XmdDL1UNxBtXK/VYR7ispk5TN9s=",
           "requires": {
-            "core-js": "^1.0.0",
-            "isomorphic-fetch": "^2.1.1",
-            "loose-envify": "^1.0.0",
-            "object-assign": "^4.1.0",
-            "promise": "^7.1.1",
-            "setimmediate": "^1.0.5",
-            "ua-parser-js": "^0.7.9"
+            "core-js": "1.2.7",
+            "isomorphic-fetch": "2.2.1",
+            "loose-envify": "1.3.1",
+            "object-assign": "4.1.1",
+            "promise": "7.3.1",
+            "setimmediate": "1.0.5",
+            "ua-parser-js": "0.7.13"
           }
         },
         "prop-types": {
@@ -2699,9 +2699,9 @@
           "resolved": "https://registry.npmjs.org/prop-types/-/prop-types-15.6.0.tgz",
           "integrity": "sha1-zq8IMCL8RrSjX2nhPvda7Q1jmFY=",
           "requires": {
-            "fbjs": "^0.8.16",
-            "loose-envify": "^1.3.1",
-            "object-assign": "^4.1.1"
+            "fbjs": "0.8.16",
+            "loose-envify": "1.3.1",
+            "object-assign": "4.1.1"
           }
         }
       }
@@ -2713,13 +2713,13 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "core-util-is": "~1.0.0",
-        "inherits": "~2.0.3",
-        "isarray": "~1.0.0",
-        "process-nextick-args": "~1.0.6",
-        "safe-buffer": "~5.1.1",
-        "string_decoder": "~1.0.3",
-        "util-deprecate": "~1.0.1"
+        "core-util-is": "1.0.2",
+        "inherits": "2.0.3",
+        "isarray": "1.0.0",
+        "process-nextick-args": "1.0.7",
+        "safe-buffer": "5.1.1",
+        "string_decoder": "1.0.3",
+        "util-deprecate": "1.0.2"
       }
     },
     "readdirp": {
@@ -2729,10 +2729,10 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "graceful-fs": "^4.1.2",
-        "minimatch": "^3.0.2",
-        "readable-stream": "^2.0.2",
-        "set-immediate-shim": "^1.0.1"
+        "graceful-fs": "4.1.11",
+        "minimatch": "3.0.4",
+        "readable-stream": "2.3.3",
+        "set-immediate-shim": "1.0.1"
       }
     },
     "regenerate": {
@@ -2753,9 +2753,9 @@
       "integrity": "sha1-On0GdSDLe3F2dp61/4aGkb7+EoM=",
       "dev": true,
       "requires": {
-        "babel-runtime": "^6.18.0",
-        "babel-types": "^6.19.0",
-        "private": "^0.1.6"
+        "babel-runtime": "6.23.0",
+        "babel-types": "6.25.0",
+        "private": "0.1.7"
       }
     },
     "regex-cache": {
@@ -2765,8 +2765,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "is-equal-shallow": "^0.1.3",
-        "is-primitive": "^2.0.0"
+        "is-equal-shallow": "0.1.3",
+        "is-primitive": "2.0.0"
       }
     },
     "regexpu-core": {
@@ -2775,9 +2775,9 @@
       "integrity": "sha1-SdA4g3uNz4v6W5pCE5k45uoq4kA=",
       "dev": true,
       "requires": {
-        "regenerate": "^1.2.1",
-        "regjsgen": "^0.2.0",
-        "regjsparser": "^0.1.4"
+        "regenerate": "1.3.2",
+        "regjsgen": "0.2.0",
+        "regjsparser": "0.1.5"
       }
     },
     "regjsgen": {
@@ -2792,7 +2792,7 @@
       "integrity": "sha1-fuj4Tcb6eS0/0K4ijSS9lJ6tIFw=",
       "dev": true,
       "requires": {
-        "jsesc": "~0.5.0"
+        "jsesc": "0.5.0"
       },
       "dependencies": {
         "jsesc": {
@@ -2829,7 +2829,7 @@
       "integrity": "sha1-UhTFOpJtNVJwdSf7q0FdvAjQbdo=",
       "dev": true,
       "requires": {
-        "is-finite": "^1.0.0"
+        "is-finite": "1.0.2"
       }
     },
     "safe-buffer": {
@@ -2868,7 +2868,7 @@
       "integrity": "sha1-AyAt9lwG0r2MfsI2KhkwVv7407E=",
       "dev": true,
       "requires": {
-        "source-map": "^0.5.6"
+        "source-map": "0.5.6"
       }
     },
     "string_decoder": {
@@ -2878,7 +2878,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "safe-buffer": "~5.1.0"
+        "safe-buffer": "5.1.1"
       }
     },
     "strip-ansi": {
@@ -2887,7 +2887,7 @@
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "dev": true,
       "requires": {
-        "ansi-regex": "^2.0.0"
+        "ansi-regex": "2.1.1"
       }
     },
     "supports-color": {
@@ -2932,7 +2932,7 @@
       "integrity": "sha1-qrGh+jDUX4jdMhFIh1rALAtV5bQ=",
       "dev": true,
       "requires": {
-        "user-home": "^1.1.1"
+        "user-home": "1.1.1"
       }
     },
     "whatwg-fetch": {
diff --git a/spec/LocalizedStrings.spec.js b/spec/LocalizedStrings.spec.js
index 8e2942e..24a6136 100644
--- a/spec/LocalizedStrings.spec.js
+++ b/spec/LocalizedStrings.spec.js
@@ -156,6 +156,11 @@ describe('Main Library Functions', function () {
       .toEqual([0, " ", false, " ", '', " ", null, " ", undefined, " ", NaN].join(''));
   });
 
+  it('Handles empty values', () => {
+    expect(strings.formatString(strings.thisKeyDoesNotExist, { thisReplacement: 'doesNotExist'}))
+      .toEqual('');
+  });
+
   describe('formatString with React components', () => {
     const reactStrings = new LocalizedStrings({
       en: {
@@ -192,4 +197,4 @@ describe('Main Library Functions', function () {
       })).toEqual(["Some ", [<span key="1" className="bold">BOLD</span>], " text"]);
     });
   });
-});
\ No newline at end of file
+});
diff --git a/src/LocalizedStrings.js b/src/LocalizedStrings.js
index 6fbe832..d8d4286 100644
--- a/src/LocalizedStrings.js
+++ b/src/LocalizedStrings.js
@@ -10,9 +10,9 @@
  * then display the correct language strings or the default language (the first
  * one if a match is not found).
  *
- * This library has been refactored to use the newly created localized-strings package so to 
+ * This library has been refactored to use the newly created localized-strings package so to
  * unify the code and make it easier to mantain
- * 
+ *
  * How to use:
  * Check the instructions at:
  * https://github.com/stefalda/react-localization
@@ -31,11 +31,11 @@ const placeholderRegex = /(\{[\d|\w]+\})/;
  * eg. 1: strings.formatString(strings.question, strings.bread, strings.butter)
  * eg. 2: strings.formatString(strings.question, { bread: strings.bread, butter: strings.butter }
  *
- * THIS METHOD OVERRIDE the one of the parent class by adding support for JSX code      
+ * THIS METHOD OVERRIDE the one of the parent class by adding support for JSX code
 */
 LocalizedStrings.prototype.formatString = (str, ...valuesForPlaceholders) => {
         let hasObject = false;
-        const res = str
+        const res = (str || '')
             .split(placeholderRegex)
             .filter(textPart => !!textPart)
             .map((textPart, index) => {