diff --git a/gulliver/system/class.form.php b/gulliver/system/class.form.php
index 67424c54e..a11e56610 100755
--- a/gulliver/system/class.form.php
+++ b/gulliver/system/class.form.php
@@ -610,6 +610,9 @@ class Form extends XmlForm
             if (in_array( $dataFieldName, $grids )) {
                 foreach ($dataField as $indexGrid => $dataGrid) {
                     foreach ($dataGrid as $fieldGridName => $fieldGridValue) {
+                        if (!isset($requiredFieldsGrids[$dataFieldName])) {
+                            $requiredFieldsGrids[$dataFieldName] = array();
+                        }
                         if (! is_array( $requiredFieldsGrids[$dataFieldName] )) {
                             $requiredFieldsGrids[$dataFieldName] = array ();
                         }
diff --git a/workflow/engine/classes/class.case.php b/workflow/engine/classes/class.case.php
index 5742a8fbb..a1e636ed7 100755
--- a/workflow/engine/classes/class.case.php
+++ b/workflow/engine/classes/class.case.php
@@ -897,7 +897,7 @@ class Cases
                     }
                 }
             } else {
-                $aReturn[$mKey] = $aArray2[$mKey];
+                $aReturn[$mKey] = isset($aArray2[$mKey]) ? $aArray2[$mKey] : null;
             }
         }
         return $aReturn;
diff --git a/workflow/engine/classes/class.derivation.php b/workflow/engine/classes/class.derivation.php
index 93a24dcee..15da88b16 100755
--- a/workflow/engine/classes/class.derivation.php
+++ b/workflow/engine/classes/class.derivation.php
@@ -84,6 +84,9 @@ class Derivation
         $taskInfo = array ();
 
         $oUser = new Users();
+        if (!class_exists('Cases')) {
+            G::LoadClass('case');
+        }
         $this->case = new Cases();
         // 1. there is no rule
         if (is_null( $aDerivation['ROU_NEXT_TASK'] )) {
diff --git a/workflow/engine/classes/class.pmFunctions.php b/workflow/engine/classes/class.pmFunctions.php
index 1fbeaedad..ba781ed51 100755
--- a/workflow/engine/classes/class.pmFunctions.php
+++ b/workflow/engine/classes/class.pmFunctions.php
@@ -2395,7 +2395,7 @@ function PMFRedirectToStep ($sApplicationUID, $iDelegation, $sStepType, $sStepUi
  * @return array | $array | List of users | Return a list of users
  *
  */
-function PMFGetNextAssignedUser ($application, $task)
+function PMFGetNextAssignedUser ($application, $task, $delIndex = null, $userUid = null)
 {
 
     require_once 'classes/model/AppDelegation.php';
@@ -2409,7 +2409,14 @@ function PMFGetNextAssignedUser ($application, $task)
     $TaskFields = $oTask->load( $task );
     $typeTask = $TaskFields['TAS_ASSIGN_TYPE'];
 
-    if ($typeTask == 'BALANCED') {
+    $g = new G();
+
+    $g->sessionVarSave();
+
+    $_SESSION['INDEX'] = (!is_null($delIndex) ? $delIndex : (isset($_SESSION['INDEX']) ? $_SESSION['INDEX'] : null));
+    $_SESSION['USER_LOGGED'] = (!is_null($userUid) ? $userUid : (isset($_SESSION['USER_LOGGED']) ? $_SESSION['USER_LOGGED'] : null));
+
+    if ($typeTask == 'BALANCED' && !is_null($_SESSION['INDEX']) && !is_null($_SESSION['USER_LOGGED'])) {
 
         G::LoadClass( 'derivation' );
         $oDerivation = new Derivation();
@@ -2423,6 +2430,8 @@ function PMFGetNextAssignedUser ($application, $task)
             $aUsers[] = $aUser;
         }
 
+        $g->sessionVarRestore();
+
         if (count( $aUsers ) == 1) {
             return $aUser;
         } else {
@@ -2430,6 +2439,7 @@ function PMFGetNextAssignedUser ($application, $task)
         }
 
     } else {
+        $g->sessionVarRestore();
         return false;
     }
 }
diff --git a/workflow/engine/methods/cases/casesSaveDataView.php b/workflow/engine/methods/cases/casesSaveDataView.php
index 43ad3f696..fa1a8a96d 100755
--- a/workflow/engine/methods/cases/casesSaveDataView.php
+++ b/workflow/engine/methods/cases/casesSaveDataView.php
@@ -29,6 +29,10 @@
 /* Includes */
 G::LoadClass( 'case' );
 
+if (!is_array($_POST['form'])) {
+    $_POST['form'] = array();
+}
+
 //load the variables
 $oCase = new Cases();
 $oCase->thisIsTheCurrentUser( $_SESSION['APPLICATION'], $_SESSION['INDEX'], $_SESSION['USER_LOGGED'], 'REDIRECT', 'casesListExtJs' );