[Dovecot] dovecot-lda segfaults with some sieve scripts

[interfaSys sàrl]

 Hello,

One account couldn't get emails all the sudden.
dovecot-lda was crashing with "signal 11 (segmentation fault)".
There was absolutely nothing in the dovecot logs, even with mail_debug=yes.

I found out that it was because of the following lines in a sieve script
that were generated by a script generator (Ingo).

if true {
    keep;
    stop;
}

I'm using the latest revision of pigeonhole with Dovecot 2.0.4.

Cheers,

Olivier