[Dovecot] BUG: Unknown internal error

Hi,

I saw this BUG message in the logfile (only one time).

dovecot: IMAP(xxx): FETCH for mailbox INBOX UID 4572 failed to read message input: Input/output error dovecot: IMAP(xxx): Disconnected: BUG: Unknown internal error isp=xxx lip=xxx rip=xxx bytes=117/341182

No core file. v1.2.12 Maildir on NFS Debian 32Bit

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