[Plugin: User Role Editor] PHP Fatal error: Call to a member function get_role()

After 3.7 update, my php log is flooded with these error messages:

[25-Jun-2012 12:56:52 UTC] PHP Fatal error: Call to a member function get_role() on a non-object in /mnt/stor7-wc2-dfasdf.com/web/content/wp-content/plugins/user-role-editor/user-role-editor.php on line 185

http://ww.wp.xz.cn/extend/plugins/user-role-editor/