[Mutt] #3084: mutt 1.5.6i: Segmantation fault when trying to write mailbox (as non-root)

[Mutt <fleas@xxxxxxxx>]

#3084: mutt 1.5.6i: Segmantation fault when trying to write mailbox (as 
non-root)

 Reproduction info (Centos4):

 -Log in as non-priviledged user
 -Start mutt
 -In the messagelist find an uread message and press enter to read it
 -Press q to return to the list
 -Press q again to exit mutt
 -Now we have a segmentation fault and the inbox is left unchanged (the
 message will still be listed a unread next time mutt starts).

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Ticket URL: <http://dev.mutt.org/trac/ticket/3084>