[Dovecot] panic 1.2.7

[Cor Bosman]

Im seeing multiple users with this same panic now. Probably a few an  
hour (out of tens of thousands of users, so nothing overly dramatic),  
and a new panic as well:

Nov 11 14:34:59 userimap20.xs4all.nl dovecot: IMAP(yyyyyy): Panic:  
file maildir-uidlist.c: line 403  
(maildir_uidlist_records_array_delete): assertion failed: (pos != NULL)
Nov 11 14:34:59 userimap20.xs4all.nl dovecot: IMAP(yyyyyy): Raw  
backtrace: imap [0x4a6c02] -> imap [0x4a6c83] -> imap [0x4a6346] ->  
imap [0x44347c] -> imap(maildir_uidlist_refresh+0x8f5) [0x444425] ->  
imap [0x440e60] -> imap(maildir_storage_sync_init+0x148) [0x441338] ->  
imap(imap_sync_init+0x68) [0x42bc88] -> imap [0x41eeee] -> imap  
[0x45e37e] -> imap(io_loop_handle_timeouts+0xfb) [0x4ae4ab] ->  
imap(io_loop_handler_run+0x71) [0x4aed51] -> imap(io_loop_run+0x18)  
[0x4ae228] -> imap(main+0x537) [0x42c707] -> /lib/libc.so. 
6(__libc_start_main+0xe6) [0x7f913b3b11a6] -> imap [0x41c859]
Nov 11 14:34:59 userimap20.xs4all.nl dovecot: dovecot: child 11196  
(imap) killed with signal 6 (core dumps disabled)