diff --git a/workflow/engine/methods/cases/ajaxListener.php b/workflow/engine/methods/cases/ajaxListener.php
index b87df05c3..eea2073c8 100755
--- a/workflow/engine/methods/cases/ajaxListener.php
+++ b/workflow/engine/methods/cases/ajaxListener.php
@@ -55,9 +55,9 @@ class Ajax
     G::LoadClass('pmScript');
     G::LoadClass('case');
 
-    $PRO_UID = $_SESSION['PROCESS'];
-    $TAS_UID = $_SESSION['TASK'];
-    $APP_UID = $_SESSION['APPLICATION'];
+    $PRO_UID = isset($_SESSION['PROCESS'])?$_SESSION['PROCESS']:'';
+    $TAS_UID = isset($_SESSION['TASK'])?$_SESSION['TASK']:'';
+    $APP_UID = isset($_SESSION['APPLICATION'])?$_SESSION['APPLICATION']:'';
     $tree = Array();
     $case = new Cases;
     $step = new Step;
diff --git a/workflow/engine/templates/cases/open.js b/workflow/engine/templates/cases/open.js
index e69b89182..fe55b7642 100755
--- a/workflow/engine/templates/cases/open.js
+++ b/workflow/engine/templates/cases/open.js
@@ -12,7 +12,7 @@ Ext.onReady(function(){
   Ext.QuickTips.init();
   showCaseNavigatorPanel = function(steps, information, action) {
 
-    if(steps==false&&action==false){
+    if(steps==false&&action==false&&typeof(treeToReviseTitle)!='undefined'){
       var treeToRevise = new Ext.tree.TreePanel({
         title: treeToReviseTitle,
         width: 250,