diff --git a/workflow/engine/methods/cases/proxyReassignUsersList.php b/workflow/engine/methods/cases/proxyReassignUsersList.php
index 797b1247b..5b8a7cbe9 100755
--- a/workflow/engine/methods/cases/proxyReassignUsersList.php
+++ b/workflow/engine/methods/cases/proxyReassignUsersList.php
@@ -70,13 +70,15 @@ $oConf = new Configurations();
 $aUsersInvolved = Array();
 
 $ConfEnv = $oConf->getFormats();
-G::LoadClass( 'tasks' );
-$task = new Task();
-$tasks = $task->load($TaskUid);
-$rows = $oCases->getUsersToReassign($TaskUid, $_SESSION['USER_LOGGED'], $tasks['PRO_UID']);
-foreach ($rows as $row) {
-    $sCaseUser = G::getFormatUserList( $ConfEnv['format'], $row );
-    $aUsersInvolved[] = array ('userUid' => $row['USR_UID'], 'userFullname' => $sCaseUser);
+if ($TaskUid != '') {
+    G::LoadClass( 'tasks' );
+    $task = new Task();
+    $tasks = $task->load($TaskUid);
+    $rows = $oCases->getUsersToReassign($TaskUid, $_SESSION['USER_LOGGED'], $tasks['PRO_UID']);
+    foreach ($rows as $row) {
+        $sCaseUser = G::getFormatUserList( $ConfEnv['format'], $row );
+        $aUsersInvolved[] = array ('userUid' => $row['USR_UID'], 'userFullname' => $sCaseUser);
+    }
 }
 
 //            $oTmp = new stdClass();