diff --git a/app/assets/javascripts/discourse/controllers/user-topics-list.js.es6 b/app/assets/javascripts/discourse/controllers/user-topics-list.js.es6
index 956557c14ea..9f877a1bb38 100644
--- a/app/assets/javascripts/discourse/controllers/user-topics-list.js.es6
+++ b/app/assets/javascripts/discourse/controllers/user-topics-list.js.es6
@@ -31,7 +31,8 @@ export default Ember.Controller.extend({
   },
 
   unsubscribe() {
-    this.messageBus.unsubscribe(this.get('channel'));
+    const channel = this.get('channel');
+    if (channel) this.messageBus.unsubscribe(channel);
     this._resetTracking();
     this.set('channel', null);
   },