diff --git a/src/main/java/org/olat/modules/lecture/ui/wizard/InformStepController.java b/src/main/java/org/olat/modules/lecture/ui/wizard/InformStepController.java
index d2f0002e3915eee5678a146cca6b5561c2fa3879..fdd9c71a6b5beb6b429c6d2016170bc6393ee7dd 100644
--- a/src/main/java/org/olat/modules/lecture/ui/wizard/InformStepController.java
+++ b/src/main/java/org/olat/modules/lecture/ui/wizard/InformStepController.java
@@ -62,7 +62,7 @@ public class InformStepController extends StepFormBasicController {
 
 	@Override
 	protected void doDispose() {
-		//
+		mainForm.removeSubFormListener(teachersCtrl);
 	}
 
 	@Override