[Dovecot] assertion failed

[Ian P. Christian]

Does anyone know what might cause this?

# dovecot --version
1.1.7

Feb 17 18:21:51 imap-proxy-temp dovecot: Panic: auth(default): file
passdb-cache.c: line 121 (passdb_cache_lookup_credentials): assertion
failed: (*scheme_r != NULL || *password_r == NULL)
Feb 17 18:21:51 imap-proxy-temp dovecot: auth(default): Raw backtrace:
dovecot-auth [0x42c0ea] -> dovecot-auth [0x42c143] -> dovecot-auth
[0x42b7f6] -> dovecot-auth [0x41acb6] ->
dovecot-auth(auth_request_lookup_credentials+0x6f) [0x411cdf] ->
dovecot-auth [0x416caf] ->
dovecot-auth(auth_request_handler_auth_continue+0xc9) [0x4128e9] ->
dovecot-auth [0x40e40a] -> dovecot-auth(io_loop_handler_run+0xf8)
[0x42fb48] -> dovecot-auth(io_loop_run+0x1d) [0x42ea4d] ->
dovecot-auth(main+0x2f7) [0x416367] ->
/lib/libc.so.6(__libc_start_main+0xda) [0x7f83990e54ca] ->
dovecot-auth [0x40cdba]
Feb 17 18:21:51 imap-proxy-temp dovecot: child 20579 (auth) killed with signal 6