diff --git a/workflow/engine/classes/ProcessMap.php b/workflow/engine/classes/ProcessMap.php
index a99c9ab00..525dbaabf 100644
--- a/workflow/engine/classes/ProcessMap.php
+++ b/workflow/engine/classes/ProcessMap.php
@@ -1954,7 +1954,7 @@ class ProcessMap
             $oDataset->next();
         }
         global $_DBArray;
-        $_DBArray = (isset($_SESSION['_DBArray']) ? $_SESSION['_DBArray'] : '');
+        $_DBArray = (isset($_SESSION['_DBArray']) ? $_SESSION['_DBArray'] : []);
         $_DBArray['outputDocArray'] = $outputDocArray;
         $_SESSION['_DBArray'] = $_DBArray;