diff --git a/client/js/views/base_view.js b/client/js/views/base_view.js
index 9cfc76c8..bdeef9d4 100644
--- a/client/js/views/base_view.js
+++ b/client/js/views/base_view.js
@@ -6,6 +6,9 @@ const contentHolder = document.getElementById('content-holder');
 require('../util/polyfill.js');
 
 function messageHandler(message, className) {
+    if (!message) {
+        message = 'Unknown message';
+    }
     const messagesHolder = contentHolder.querySelector('.messages');
     if (!messagesHolder) {
         alert(message);