dbmail 3.1.17: crash dbmail-imapd

Maxim <[email protected]>
Newsgroups gmane.mail.imap.dbmail
Message-ID <[email protected]>
Hello,

system:
     dbmail 3.1.17
     Debian 7 with last updates

the last two days dbmail-imapd frequently falls, and the error log for 
the following message:

 >  dbmail-imapd: dm_string.c:161: p_string_erase: Assertion `pos + len 
<= S->used' failed.

it happens on several servers.
I tried to recompile dbmail after an upgradesystem.
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