Dovecot 2.4: Segfault for "doveadm proxy kick foo bar"

Hi!

The following command segfaults on Dovecot 2.4:

#> doveadm proxy kick foo bar Segmentation fault (core dumped)

Giving only one user (doveadm proxy kick foo) works:

#> doveadm proxy kick foo 0 connections kicked

It does not matter if the users actually exist on the server (so the above command can be used verbatim). This used to work in Dovecot 2.3.

I'm running Dovecot 2.4 on Ubuntu 24.04, installed from repo.dovecot.org.

Regards, Michael