Fix load admin panels extra data - refs BT#9325

main/inc/ajax/admin.ajax.php

@@ -97,6 +97,10 @@ switch ($action) {
             $newUrlDir = api_get_path(SYS_PATH) . "home/admin/";
         }
 
+        if (!file_exists($newUrlDir)) {
+            die;
+        }
+
         if (!Security::check_abs_path("{$newUrlDir}{$blockName}_extra.html", $newUrlDir)) {
             die;
         }