New Member Confirmation Error for Membership branch

[Jaideep Khandelwal]

After merging Membership branch code , when an user responds to its confirmation mail by following the confirmation link there is an error generation which generates a bug report

    admin(17066): File "/usr/local/mailman/scripts/driver", line 101, in run_main
admin(17066): main()
admin(17066): File "/usr/local/mailman/Mailman/Cgi/confirm.py", line 117, in main
admin(17066): subscription_confirm(mlist, doc, cookie, cgidata)
admin(17066): File "/usr/local/mailman/Mailman/Cgi/confirm.py", line 357, in subscription_confirm
admin(17066): cookie, userdesc)
admin(17066): File "/usr/local/mailman/Mailman/MailList.py", line 1230, in ProcessConfirmation
admin(17066): self.ApprovedAddMember(userdesc, whence=whence)
admin(17066): File "/usr/local/mailman/Mailman/MailList.py", line 977, in ApprovedAddMember
admin(17066): password=password, language=lang)
admin(17066): File "/usr/local/mailman/Mailman/DlistMemberships.py", line 169, in addNewMember
admin(17066): raise Errors.MMAlreadyAMember, member
admin(17066): MMAlreadyAMember: <email address hidden>

here fmaster is the user that I am trying to subscribe to , although commenting on line 168-169 in Dlistmembership does solve the problem.