--- customfilter.module.orig	2009-10-15 15:54:43.000000000 +0200
+++ customfilter.module	2009-10-15 15:54:01.000000000 +0200
@@ -203,7 +203,7 @@
  */
 function customfilter_menu($may_cache) {
   $access = user_access('administer customfilter');
-  $arg = arg();
+  $arg = arg('');
   $items = array();
 
   if ($may_cache) {