diff --git a/src/main/java/org/olat/core/gui/control/generic/wizard/StepsMainRunController.java b/src/main/java/org/olat/core/gui/control/generic/wizard/StepsMainRunController.java
index 02f8db17ebad5fea247708eed23ea0ccac5d0cb5..e74b492f53c53d730ff8c0864a36ae21a578423e 100644
--- a/src/main/java/org/olat/core/gui/control/generic/wizard/StepsMainRunController.java
+++ b/src/main/java/org/olat/core/gui/control/generic/wizard/StepsMainRunController.java
@@ -417,6 +417,10 @@ public class StepsMainRunController extends FormBasicController implements Gener
 					addNextStep((StepFormController) nextChildCreator.createController(null, getWindowControl()), nextStep);
 				}
 			} else if (lastEvent == StepsEvent.ACTIVATE_PREVIOUS) {
+				if(currentStepIndex <= 0) {
+					return;// the case is possible with FireFox and users who use the keyboard and the enter key.
+				}
+				
 				stepPages.pop();
 				steps.pop();
 				currentStepIndex--;