diff --git a/app/assets/javascripts/discourse/routes/discovery-categories.js.es6 b/app/assets/javascripts/discourse/routes/discovery-categories.js.es6
index 9f4c76ee7d..d254e0e6a2 100644
--- a/app/assets/javascripts/discourse/routes/discovery-categories.js.es6
+++ b/app/assets/javascripts/discourse/routes/discovery-categories.js.es6
@@ -92,14 +92,15 @@ const DiscoveryCategoriesRoute = Discourse.Route.extend(OpenComposer, {
 
     refresh() {
       const controller = this.controllerFor("discovery/categories");
+      const discController = this.controllerFor("discovery");
 
       // Don't refresh if we're still loading
-      if (!controller || controller.get("loading")) { return; }
+      if (!discController || discController.get("loading")) { return; }
 
       // If we `send('loading')` here, due to returning true it bubbles up to the
       // router and ember throws an error due to missing `handlerInfos`.
       // Lesson learned: Don't call `loading` yourself.
-      controller.set("loading", true);
+      discController.set("loading", true);
 
       this.model().then(model => {
         this.setupController(controller, model);