ERROR: Ports Collection support for your FreeBSD version has ended o_O

Hello world :-)

After `git pull` I get this warning now on each port build:

/!\ ERROR: /!\
Ports Collection support for your FreeBSD version has ended, and no
ports are guaranteed to build on this system. Please upgrade to a
supported release.
No support will be provided if you silence this message by defining
ALLOW_UNSUPPORTED_SYSTEM.
*** Error code 1


# uname -a
FreeBSD octagon 13.1-STABLE FreeBSD 13.1-STABLE #0
stable/13-n252248-adbcdbee602d: Mon Sep  5 22:20:49 CEST 2022
root@octagon:/usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64

I have even recompiled kernel:

root@octagon:/usr/ports # cd /usr/src/

root@octagon:/usr/src # git branch
* stable/13

root@octagon:/usr/src # git remote -v
origin  https://git.freebsd.org/src.git (fetch)
origin  https://git.freebsd.org/src.git (push)


Below is the Ports part:

root@octagon:~ # cd /usr/ports/
root@octagon:/usr/ports # git branch
* main

root@octagon:/usr/ports # git remote -v
origin  https://git.freebsd.org/ports.git (fetch)
origin  https://git.freebsd.org/ports.git (push)

root@octagon:/usr/ports # git log -1
commit 2a00ac0b3d08dabf33585358a1b33cb34d2c2482 (HEAD -> main,
origin/main, origin/HEAD)
Author: Dima Panov <fluffy@FreeBSD.org>
Date:   Mon Sep 5 22:56:35 2022 +0300

    net/messagelib: USE_XORG=x11


Is it something wrong with my setup or the ports? :-P

Any hints appreciated :-)

-- 
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info