diff --git a/src/main/java/org/olat/course/nodes/cl/ui/wizard/CheckListConfigurationStepController.java b/src/main/java/org/olat/course/nodes/cl/ui/wizard/CheckListConfigurationStepController.java
index 9df2c644fe36258642a50595d58e4182a84caf5d..731735343578bc9690e14ab920628c0662a0ebb5 100644
--- a/src/main/java/org/olat/course/nodes/cl/ui/wizard/CheckListConfigurationStepController.java
+++ b/src/main/java/org/olat/course/nodes/cl/ui/wizard/CheckListConfigurationStepController.java
@@ -66,7 +66,7 @@ public class CheckListConfigurationStepController extends StepFormBasicControlle
 
 	@Override
 	protected void doDispose() {
-		//
+		mainForm.removeSubFormListener(configController);
 	}
 
 	@Override