diff --git a/js/libtextsecure.js b/js/libtextsecure.js
index 707cb08a..e56c84ad 100644
--- a/js/libtextsecure.js
+++ b/js/libtextsecure.js
@@ -37278,7 +37278,7 @@ window.axolotl.protocol = function(storage_interface) {
                                     closeSession(open_session); // To be returned and saved later
                             } else {
                                 // ...otherwise create an error that the UI will pick up and ask the user if they want to re-negotiate
-                                throw new textsecure.IncomingIdentityKeyError(encodedNumber, axolotlInternal.utils.convertToString(message.encode()));
+                                throw new Error('Unknown identity key');
                             }
                         }
                         return initSession(false, preKeyPair, signedPreKeyPair, encodedNumber, axolotlInternal.utils.convertToArrayBuffer(message.identityKey), axolotlInternal.utils.convertToArrayBuffer(message.baseKey), undefined)
diff --git a/libtextsecure/libaxolotl.js b/libtextsecure/libaxolotl.js
index 757fefdc..73d57759 100644
--- a/libtextsecure/libaxolotl.js
+++ b/libtextsecure/libaxolotl.js
@@ -37201,7 +37201,7 @@ window.axolotl.protocol = function(storage_interface) {
                                     closeSession(open_session); // To be returned and saved later
                             } else {
                                 // ...otherwise create an error that the UI will pick up and ask the user if they want to re-negotiate
-                                throw new textsecure.IncomingIdentityKeyError(encodedNumber, axolotlInternal.utils.convertToString(message.encode()));
+                                throw new Error('Unknown identity key');
                             }
                         }
                         return initSession(false, preKeyPair, signedPreKeyPair, encodedNumber, axolotlInternal.utils.convertToArrayBuffer(message.identityKey), axolotlInternal.utils.convertToArrayBuffer(message.baseKey), undefined)