diff --git a/classes/helper/HelperList.php b/classes/helper/HelperList.php
index 30969d7ac..0686a9dcf 100644
--- a/classes/helper/HelperList.php
+++ b/classes/helper/HelperList.php
@@ -195,7 +195,7 @@ public function displayListContent()
                 $position_group_identifier = Category::getRootCategory()->id;
             }
 
-            $positions = array_map(create_function('$elem', 'return (int)($elem[\'position\']);'), $this->_list);
+            $positions = array_map(function ($elem) { return (int)($elem['position']); }, $this->_list);
             sort($positions);
         }
 
@@ -623,7 +623,7 @@ public function displayListHeader()
                     if (is_string($value)) {
                         $value = json_decode($value, true);
                     }
-                    if (!Validate::isCleanHtml($value[0]) || !Validate::isCleanHtml($value[1])) {
+                    if (isset($value[0]) && !Validate::isCleanHtml($value[0]) || isset($value[1]) && !Validate::isCleanHtml($value[1])) {
                         $value = '';
                     }
                     $name = $this->list_id.'Filter_'.(isset($params['filter_key']) ? $params['filter_key'] : $key);