diff --git a/SignalMetadataKit/src/SMKSecretSessionCipher.swift b/SignalMetadataKit/src/SMKSecretSessionCipher.swift
index 55fc59d..cb6f282 100644
--- a/SignalMetadataKit/src/SMKSecretSessionCipher.swift
+++ b/SignalMetadataKit/src/SMKSecretSessionCipher.swift
@@ -487,7 +487,7 @@ public class SMKDecryptResult: NSObject {
         var cipherMessage: CipherMessage
         switch (messageContent.messageType) {
         case .whisper:
-            cipherMessage = WhisperMessage(data: messageContent.contentData)
+            cipherMessage = try WhisperMessage(data: messageContent.contentData)
         case .prekey:
             cipherMessage = try PreKeyWhisperMessage(data: messageContent.contentData)
         }