diff --git a/web/app/assets/javascripts/JamServer.js b/web/app/assets/javascripts/JamServer.js
index 098017c50..ff82b7856 100644
--- a/web/app/assets/javascripts/JamServer.js
+++ b/web/app/assets/javascripts/JamServer.js
@@ -229,7 +229,7 @@
 
       activeElementEvent('afterConnect', payload);
 
-      if(payload.client_update) {
+      if(payload.client_update && context.JK.ClientUpdateInstance) {
         context.JK.ClientUpdateInstance.runCheck(payload.client_update.product, payload.client_update.version, payload.client_update.uri, payload.client_update.size)
       }
     }