notice in token_node.inc while creating a book page

The notice only shows when creating, and dealing with books. I know its fixed in MAIN, this applies to 6--1. I didn't trace the code through to find out why $menu_link['menu_name'] is undef, just a quick fix.

Index: token_node.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/token/token_node.inc,v
retrieving revision 1.5.4.11
diff -r1.5.4.11 token_node.inc
77c77
<         $menu = $menus[$menu_link['menu_name']];
---
>         $menu = isset($menus[$menu_link['menu_name']]) ? $menus[$menu_link['menu_name']] : '';

Thanks.