When I went to bug #7537 and clicked on "Show dependency tree", I got:

Bugs that bug 7537 depends on

Bugs that depend on bug 7537

     Content-type: text/html

     Software error:

     select bug_id, bug_status, assigned_to, short_desc from bugs where
bug_id = 7602 and bugs.groupset & = bugs.groupset:
     parse error near '= bugs.groupset' at line 1 at globals.pl line 61.

     For help, please send mail to the webmaster
(webmaster.com), giving this error message and the time and
date of the error. ;