diff --git a/app/controllers/my_courses.php b/app/controllers/my_courses.php
index 3071e8c2405f1d606f8f094814e994a39d6a7398..45deae3f09dbc1f12b622e793d8f45ee22c2d83f 100644
--- a/app/controllers/my_courses.php
+++ b/app/controllers/my_courses.php
@@ -190,7 +190,7 @@ class MyCoursesController extends AuthenticatedController
             'user_id' => $GLOBALS['user']->id,
             'config'  => [
                 'allow_dozent_visibility'  => Config::get()->ALLOW_DOZENT_VISIBILITY,
-                'open_groups'              => $GLOBALS['user']->cfg->MY_COURSES_OPEN_GROUPS,
+                'open_groups'              => array_values($GLOBALS['user']->cfg->MY_COURSES_OPEN_GROUPS),
                 'sem_number'               => Config::get()->IMPORTANT_SEMNUMBER,
                 'display_type'             => $GLOBALS['user']->cfg->MY_COURSES_TILED_DISPLAY ? 'tiles' : 'tables',
                 'responsive_type'          => $GLOBALS['user']->cfg->MY_COURSES_TILED_DISPLAY_RESPONSIVE ? 'tiles' : 'tables',