diff --git a/app/controllers/course/timesrooms.php b/app/controllers/course/timesrooms.php
index 1f0ab17b5320c05cd52e3cb2568482aa79cf631e..ddd6883ae4dcf180be9b91f9ca154118f4c76cab 100644
--- a/app/controllers/course/timesrooms.php
+++ b/app/controllers/course/timesrooms.php
@@ -1486,7 +1486,7 @@ class Course_TimesroomsController extends AuthenticatedController
         Sidebar::Get()->addWidget($widget);
 
 
-        if ($GLOBALS['perm']->have_studip_perm('admin', $this->course_id)) {
+        if ($GLOBALS['perm']->have_studip_perm('admin', $this->course->id)) {
             $widget = new CourseManagementSelectWidget();
             Sidebar::get()->addWidget($widget);
         }