diff --git a/addons/web/static/src/js/chrome/view_manager.js b/addons/web/static/src/js/chrome/view_manager.js
index b6208df272d..ebd063d7360 100644
--- a/addons/web/static/src/js/chrome/view_manager.js
+++ b/addons/web/static/src/js/chrome/view_manager.js
@@ -53,7 +53,8 @@ var ViewManager = Widget.extend(ControlPanelMixin, {
      */
     on_attach_callback: function() {
         this.is_in_DOM = true;
-        if (this.active_view && this.active_view.controller.on_attach_callback) {
+        var controller = this.active_view && this.active_view.controller;
+        if (controller && this.active_view.controller.on_attach_callback) {
             this.active_view.controller.on_attach_callback();
         }
     },