AssertionError when Web-canceling subscribtion in 2.1.5

[Rspecht]

I subscribe to a mailing list and get the confirmation mail. I go to the
web confirmation page and choose NOT to confirm but to cancel the
subscription, I get the following traceback.
Confirming a subscription through web works fine though.

[----- Mailman Version: 2.1.5 -----]
[----- Traceback ------]
Traceback (most recent call last):
  File "/home/pacs/rsp00/mailman/scripts/driver", line 87, in run_main
    main()
  File "/home/pacs/rsp00/mailman/Mailman/Cgi/confirm.py", line 114, in
main
    subscription_cancel(mlist, doc, cookie)
  File "/home/pacs/rsp00/mailman/Mailman/Cgi/confirm.py", line 312, in
subscription_cancel
    userdesc = mlist.pend_confirm(cookie)[1]
  File "/home/pacs/rsp00/mailman/Mailman/Pending.py", line 141, in
pend_confirm
    assert self.Locked()
AssertionError

[----- Python Information -----]
sys.version = 2.1.3 (#1, Sep 7 2002, 15:29:56) [GCC 2.95.4 20011002
(Debian prerelease)]
sys.executable = /usr/bin/python
sys.platform = linux2

[http://sourceforge.net/tracker/index.php?func=detail&aid=954806&group_id=103&atid=100103]

[Tokio Kikuchi (tkikuchi)]

Thank Jim Tittsler for patch. This was fixed in CVS.