diff --git a/lib/classes/Seminar.class.php b/lib/classes/Seminar.class.php
index 4b8e6e4e441a83f16aee593cd1fc1bfad90e75a3..2ce08954794a1961d7aeed3249d0d1543efb564e 100644
--- a/lib/classes/Seminar.class.php
+++ b/lib/classes/Seminar.class.php
@@ -2162,7 +2162,7 @@ get_title_for_status('dozent', 1, $this->status)));
                 $membership->store();
             },
             "Seminar_id = ? AND user_id = IN (?)",
-            [$this->course_id, $members]
+            [$this->id, $members]
         );
         return $this;
     }