Client crashes at login, because of citygovenorsetting

[Attenfc]

I made a setting in citygovenor, that now causes my client to crash every time I try to log in.

I had a city, with population 2, that only needed 1 more food to grow, so I tried different govenors.
On Prefer Gold I noticed it made a taxspecialist - when I unchecked 'allow specialists' - then my client crashed.
I might have enabled 'optimize'.

Now the freeciv client crashes every time I log in.
I am on linux/debian, so I created a new useraccount and a new client (to make sure I am free from user config, temp and cache files), but it still crashes at login.

The error message (in the terminal) is:
terminate called after throwing an instance of 'std::out_of_range'
what(): vector::_M_range_check: __n (which is 0) >= this->size() (which is 0)
Aborted

Expected behavior
That the client does not crash - or allow me to disable the citygovenor.

Screenshots
The crash happens immediately after login - with no time to make screenshot.

Platform and version (please complete the following information):

• OS: Linux/Debian 12
• Freeciv21 version: freeciv21-client 3.1-beta.1
• Ruleset/Longturn game (if applicable): LT85 - user Akhenaten

Additional context
I guess, without insight, it could be the citysetting on the server that causes the client to crash when log in.
The client connects fine to another game.

[Attenfc]

I reproduced the crash on a local game.
A city with population 2.
Chosing govenor prefer gold, seeing a taxcollector..
When unselecting allow specialist the client crashes.
Also with govenor prefer science, seing a scientist, unselecting allow specialist, causes the client to crash.
I can reload the game, that was saved a turnbegin, and it works fine.
I guess it is the customgovenor that cannot handle the existing specialist, when not allowing them.

[blabber]

@Attenfc, could you provide a savegame for the local game in which you could reproduce the issue?

[Attenfc]

t28_jordan.sav.gz
In two different cities I just tried to uncheck 'allow specialist' and in both cases the client crashed - regardless of the govenor (prefer gold or prefer food).

[blabber]

I can reproduce this is issue and it seems as if you are not playing one of our official builds, right? Can you confirm that you are playing on a self compiled client from master?

If yes, please try with one of pre-built releases. Master has a bug in the caching of specialist outputs, that was introduced after we rolled out 3.1-beta.1.

[Attenfc]

Yes, I build from a master i cloned in may - I did not know any better.
Now I try to build from https://github.com/longturn/freeciv21/releases/download/v3.0-patch.4/Freeciv21-v3.0-patch.4.tar.gz
I assume this is what you mean with pre-built release?

[jwrober]

We offer pre-compiled binaries - https://longturn.readthedocs.io/en/latest/Getting/install.html. You don't have to build all the time.

[Attenfc]

My specific issue is now solved.
I built from https://github.com/longturn/freeciv21/releases/download/v3.0-patch.4/Freeciv21-v3.0-patch.4.tar.gz
and are thereby running client version freeciv21-client 3.0.940577.3-patch
which allows me to login, and I looks like I can play my turn now.

Thank you very much for the fast response and clarifications.

I must carefully reread some docs to find the actual prebuilt release binary - I always end up with a file that only has source - but it builds fine in 10 min, so I dont mind.