diff --git a/extensions/embed/js/forum/src/components/DiscussionPage.js b/extensions/embed/js/forum/src/components/DiscussionPage.js
index 9524b3437..8e436f054 100644
--- a/extensions/embed/js/forum/src/components/DiscussionPage.js
+++ b/extensions/embed/js/forum/src/components/DiscussionPage.js
@@ -29,7 +29,7 @@ export default class DiscussionPage extends BaseDiscussionPage {
   sidebarItems() {
     const items = super.sidebarItems();
 
-    delete items.scrubber;
+    items.remove('scrubber');
 
     return items;
   }
diff --git a/extensions/embed/js/forum/src/main.js b/extensions/embed/js/forum/src/main.js
index bf7529f0d..53d1d7948 100644
--- a/extensions/embed/js/forum/src/main.js
+++ b/extensions/embed/js/forum/src/main.js
@@ -10,7 +10,7 @@ import Drawer from 'flarum/utils/Drawer';
 
 import DiscussionPage from 'flarum/embed/components/DiscussionPage';
 
-app.initializers.boot.content = app => {
+app.initializers.replace('boot', () => {
   m.route.mode = 'pathname';
 
   override(m, 'route', function(original, root, arg1, arg2, vdom) {
@@ -56,4 +56,4 @@ app.initializers.boot.content = app => {
     basePath + '/',
     mapRoutes(app.routes, basePath)
   );
-};
+});