diff --git a/menu_token.module b/menu_token.module
index 1907fd4..890c219 100644
--- a/menu_token.module
+++ b/menu_token.module
@@ -182,7 +182,7 @@ function menu_token_menu_link_alter(&$item) {
  */
 function _menu_token_is_called_from_features() {
   $called = &drupal_static(__FUNCTION__);
-  if (!isset($called)) {
+  if (!isset($called) && defined('DEBUG_BACKTRACE_IGNORE_ARGS')) {
     $callstack = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
     foreach($callstack as $function) {
       $called = ($function['function'] == 'menu_links_features_export_render');