diff --git a/workflow/engine/classes/model/Process.php b/workflow/engine/classes/model/Process.php
index e8c7ec785..8c1336e46 100755
--- a/workflow/engine/classes/model/Process.php
+++ b/workflow/engine/classes/model/Process.php
@@ -467,7 +467,7 @@ class Process extends BaseProcess
         $this->setProTriReassigned( isset( $aData['PRO_TRI_REASSIGNED'] ) ? $aData['PRO_TRI_REASSIGNED'] : '' );
         $this->setProShowDelegate( $aData['PRO_SHOW_DELEGATE'] );
         $this->setProShowDynaform( $aData['PRO_SHOW_DYNAFORM'] );
-        $this->setProDerivationScreenTpl($aData['PRO_DERIVATION_SCREEN_TPL']);
+        $this->setProDerivationScreenTpl( isset( $aData['PRO_DERIVATION_SCREEN_TPL']) ? $aData['PRO_DERIVATION_SCREEN_TPL'] : '' );
 
         // validate if the category exists
         $criteria = new Criteria( 'workflow' );