[Dovecot] crash (assertion failed: (uidlist->lock_count == 1)

Hi,

with 1.0-test79

Aug 3 16:18:23 ymmv dovecot: IMAP(jh): file maildir-uidlist.c: line 536 (maildir_uidlist_rewrite): assertion failed: (uidlist->lock_count == 1) Aug 3 16:18:23 ymmv dovecot: child 10780 (imap) killed with signal 6

Any idea what that is? I did no special operation, just selected a mail to read with thunderbird (1.06). After restarting TB it worked.