diff --git a/src/main/java/org/olat/course/nodes/gta/ui/GTAIdentityListCourseNodeController.java b/src/main/java/org/olat/course/nodes/gta/ui/GTAIdentityListCourseNodeController.java
index 85eb94368a9121a073c099b57e9064a7b68d9ee3..951b762ad718deab4e02c77e34b36afa34fb2778 100644
--- a/src/main/java/org/olat/course/nodes/gta/ui/GTAIdentityListCourseNodeController.java
+++ b/src/main/java/org/olat/course/nodes/gta/ui/GTAIdentityListCourseNodeController.java
@@ -206,9 +206,7 @@ public class GTAIdentityListCourseNodeController extends IdentityListCourseNodeC
 
 	@Override
 	protected void cleanUp() {
-		removeAsListenerAndDispose(bulkAssessmentToolCtrl);
 		removeAsListenerAndDispose(assessmentCtrl);
-		bulkAssessmentToolCtrl = null;
 		assessmentCtrl = null;
 		super.cleanUp();
 	}