[Dovecot] Imap assertion (dovecot-1.1.beta13)

Hi, I continue testing the beta versions and have seen a great improvement over the last few ones. On beta13 I'm seeing the following assert on some client folders: file index-mail.c: line 759 (index_mail_stream_destroy_callback): assertion failed: (mail->data.destroying_stream)

If you need I can try and reproduce this in a more controled environment to pinpoint the problem.

Thanks,

Nuno Lopes