diff --git a/admin/themes/default/template/user_list.tpl b/admin/themes/default/template/user_list.tpl
index 79abbe985..4b255dc01 100644
--- a/admin/themes/default/template/user_list.tpl
+++ b/admin/themes/default/template/user_list.tpl
@@ -615,7 +615,13 @@ jQuery(document).on('click', '.close-user-details',  function(e) {
     processing: true,
     serverSide: true,
 		serverMethod: "POST",
-    ajaxSource: "admin/user_list_backend.php",
+    ajax: {
+        url : "admin/user_list_backend.php",
+        type : "POST",
+        data : {
+            pwg_token : pwg_token
+        }
+    },
 		pagingType: "simple",
     language: {
       processing: "{/literal}{'Loading...'|translate|escape:'javascript'}{literal}",
diff --git a/admin/user_list_backend.php b/admin/user_list_backend.php
index 50673fae0..87509a4bc 100644
--- a/admin/user_list_backend.php
+++ b/admin/user_list_backend.php
@@ -70,7 +70,8 @@ if ( isset( $_REQUEST['iDisplayStart'] ) && $_REQUEST['iDisplayLength'] != '-1'
   $sLimit = "LIMIT ".$_REQUEST['iDisplayStart'].", ".$_REQUEST['iDisplayLength'];
 }
 	
-	
+$sOrder = "";
+
 /*
  * Ordering
  */
@@ -104,7 +105,7 @@ if ( isset( $_REQUEST['iSortCol_0'] ) )
  * on very large tables, and MySQL's regex functionality is very limited
  */
 $sWhere = "";
-if ( $_REQUEST['sSearch'] != "" )
+if ( isSet( $_REQUEST['sSearch']) && $_REQUEST['sSearch'] != "" )
 {
   $sWhere = "WHERE (";
   for ( $i=0 ; $i<count($aColumns) ; $i++ )
@@ -161,12 +162,13 @@ $rResultTotal = pwg_query($sQuery);
 $aResultTotal = pwg_db_fetch_array($rResultTotal);
 $iTotal = $aResultTotal[0];
 	
-	
+$sEcho = isSet($_REQUEST['sEcho']) ? intval($_REQUEST['sEcho']) : 0;
+
 /*
  * Output
  */
 $output = array(
-  "sEcho" => intval($_REQUEST['sEcho']),
+  "sEcho" => $sEcho,
   "iTotalRecords" => $iTotal,
   "iTotalDisplayRecords" => $iFilteredTotal,
   "aaData" => array()