Panic: file userdb-blocking with Dovecot 2.3.19

[Stuart Henderson]

On 2022-05-24, Niklas Meyer <info at servercow.de> wrote:
> since we´ve tested around with the new dovecot release in the mailcow 
> project we´ve came across a curious and new error with Dovecot:
>
> /auth: Panic: file userdb-blocking.c: line 124 
> (userdb_blocking_iter_next): assertion failed: (ctx->conn != NULL)/

This is fixed in https://github.com/dovecot/core/commit/30e69471792aec8