diff --git a/workflow/engine/classes/class.case.php b/workflow/engine/classes/class.case.php
index 84948b5b1..145002247 100755
--- a/workflow/engine/classes/class.case.php
+++ b/workflow/engine/classes/class.case.php
@@ -1111,6 +1111,7 @@ class Cases
             }
             $inbox = new ListInbox();
             unset($Fields['DEL_INIT_DATE']);
+            unset($Fields['DEL_DELEGATE_DATE']);
             $inbox->update(array_merge($Fields, $arrayNewCaseTitleAndDescription));
             /*----------------------------------********---------------------------------*/