diff --git a/app/controllers/course/wiki.php b/app/controllers/course/wiki.php
index b8a50dc6880936dbeebfb2c6b0c198bffdcf34e9..738d0e7db5a2126d9c7a415271d4735c42604d08 100644
--- a/app/controllers/course/wiki.php
+++ b/app/controllers/course/wiki.php
@@ -511,6 +511,7 @@ class Course_WikiController extends AuthenticatedController
             $this->render_json([
                 'error' => 'user_not_requested_edit_mode'
             ]);
+            return;
         }
 
         $online_user_me->editing = 0;