error during subscription process

[Cmeme]

One user trying to subscribe got the following email
message:

Bug in Mailman version 2.0.13
We're sorry, we hit a bug!

The information in the log are:

admin(8347): [----- Mailman Version: 2.0.13 -----]
admin(8347): [----- Traceback ------]
admin(8347): Traceback (innermost last):
admin(8347): File "/var/mailman/scripts/driver", line 96,
in run_main
admin(8347): main()
admin(8347):
File "/var/mailman/Mailman/Cgi/subscribe.py", line 76, in
main
admin(8347): process_form(mlist, doc)
admin(8347):
File "/var/mailman/Mailman/Cgi/subscribe.py", line 104,
in process_form
admin(8347): if form.has_key("UserOptions") or \
admin(8347):
File "/var/mailman/Mailman/pythonlib/cgi.py", line 564,
in has_key
admin(8347): raise TypeError, "not indexable"
admin(8347): TypeError: not indexable

admin(8347): [----- Python Information -----]
admin(8347): sys.version = 1.5.2 (#1, Jul 5 2001,
03:02:19) [GCC 2.96 20000731 (Red Hat Linux 7.1 2
admin(8347): sys.executable = /usr/bin/python
admin(8347): sys.prefix = /usr
admin(8347): sys.exec_prefix= /usr
admin(8347): sys.path = /usr
admin(8347): sys.platform = linux-i386

[http://sourceforge.net/tracker/index.php?func=detail&aid=631447&group_id=103&atid=100103]