diff --git a/workflow/engine/classes/model/Configuration.php b/workflow/engine/classes/model/Configuration.php
index a2a18a261..000044a8d 100755
--- a/workflow/engine/classes/model/Configuration.php
+++ b/workflow/engine/classes/model/Configuration.php
@@ -127,7 +127,7 @@ class Configuration extends BaseConfiguration
         }
     }
 
-    public function exists($CfgUid, $ObjUid, $ProUid, $UsrUid, $AppUid)
+    public function exists($CfgUid, $ObjUid='', $ProUid='', $UsrUid='', $AppUid='')
     {
         $oRow = ConfigurationPeer::retrieveByPK( $CfgUid, $ObjUid, $ProUid, $UsrUid, $AppUid );
         return (( get_class ($oRow) == 'Configuration' )&&(!is_null($oRow)));
diff --git a/workflow/engine/templates/cases/casesDocuments.js b/workflow/engine/templates/cases/casesDocuments.js
index 23dc09abe..7e229a05e 100755
--- a/workflow/engine/templates/cases/casesDocuments.js
+++ b/workflow/engine/templates/cases/casesDocuments.js
@@ -457,6 +457,9 @@ function openActionDialog(caller, action, dataAux)
       break;
 
     case 'download':
+      if(ext_itemgrid.getSelectionModel().getSelected() == undefined) {
+         break;
+      }
       fileName=ext_itemgrid.getSelectionModel().getSelected().get('name');
       // alert(ext_itemgrid.getSelectionModel().getSelected().get('downloadLink'));
       // alert(ext_itemgrid.getSelectionModel().getSelected().get('downloadLabel'));