diff --git a/libs/core/core.read_cache_file.php b/libs/core/core.read_cache_file.php
index 2ba4157b..2ab42811 100644
--- a/libs/core/core.read_cache_file.php
+++ b/libs/core/core.read_cache_file.php
@@ -35,7 +35,7 @@ function smarty_core_read_cache_file(&$params, &$smarty)
     if (!empty($smarty->cache_handler_func)) {
         // use cache_handler function
         call_user_func_array($smarty->cache_handler_func,
-                             array('read', &$smarty, &$params['results'], $params['tpl_file'], $params['cache_id'], $params['compile_id']));
+                             array('read', &$smarty, &$params['results'], $params['tpl_file'], $params['cache_id'], $params['compile_id'], null));
     } else {
         // use local cache file
         $_auto_id = $smarty->_get_auto_id($params['cache_id'], $params['compile_id']);