diff --git a/app/controllers/course/members.php b/app/controllers/course/members.php
index 40ebef1c4ccbeb8b972d627d00db778ea82ad19b..c3610a8c220359d828b63dc0a95b2e7e6832510d 100644
--- a/app/controllers/course/members.php
+++ b/app/controllers/course/members.php
@@ -86,7 +86,7 @@ class Course_MembersController extends AuthenticatedController
         ];
 
         //check for admission / waiting list
-        AdmissionApplication::addMembers($this->course->id);
+        AdmissionApplication::addMembers($this->course_id);
         $this->checkUserVisibility();
     }