diff --git a/workflow/engine/classes/class.case.php b/workflow/engine/classes/class.case.php
index 51837f16f..828c1e9f4 100644
--- a/workflow/engine/classes/class.case.php
+++ b/workflow/engine/classes/class.case.php
@@ -2331,7 +2331,9 @@ class Cases
             $rs->next();
             $row = $rs->getRow();
             $iLastStep = intval($row[0]);
-
+            if ($iPosition > $iLastStep) {
+                throw (new Exception(G::LoadTranslation('ID_STEP_DOES_NOT_EXIST', array(G::LoadTranslation('ID_POSITION'), $iPosition))));
+            }
             $iPosition += 1;
             $aNextStep = null;
             if ($iPosition <= $iLastStep) {