diff --git a/workflow/engine/classes/class.derivation.php b/workflow/engine/classes/class.derivation.php
index 716954179..60e226529 100644
--- a/workflow/engine/classes/class.derivation.php
+++ b/workflow/engine/classes/class.derivation.php
@@ -1016,8 +1016,8 @@ class Derivation
                         $criteria->addSelectColumn(RoutePeer::TAS_UID);
                         $criteria->addJoin(RoutePeer::TAS_UID, AppDelegationPeer::TAS_UID);
                         $criteria->add(RoutePeer::PRO_UID, $appFields['PRO_UID']);
-                        $criteria->add(RoutePeer::ROU_NEXT_TASK, $nextDel['ROU_PREVIOUS_TASK']);
-                        $criteria->add(RoutePeer::ROU_TYPE, $nextDel['ROU_PREVIOUS_TYPE']);
+                        $criteria->add(RoutePeer::ROU_NEXT_TASK, isset($nextDel['ROU_PREVIOUS_TASK']) ? $nextDel['ROU_PREVIOUS_TASK'] : '');
+                        $criteria->add(RoutePeer::ROU_TYPE, isset($nextDel['ROU_PREVIOUS_TYPE']) ? $nextDel['ROU_PREVIOUS_TYPE'] : '');
                         $criteria->add(AppDelegationPeer::DEL_THREAD_STATUS, 'OPEN');
                         $rsCriteria = RoutePeer::doSelectRS($criteria);
                         $rsCriteria->setFetchmode(ResultSet::FETCHMODE_ASSOC);