If it is related to the war code, maybe some fallback in case of unexpected war types added by special situations or mods could be useful?

Are you using a mod? I think the new changes to the way wars are declared (to get the war type available for the message as to if it's a raid/invasion) may have broken them. If not, it's the insect god (I've fixed that now, regardless, just in case, and it'll be in the next patch).

If there are mods, I should inform modders while there is still time to fix stuff.

Originally posted by crawlers:

If it is related to the war code, maybe some fallback in case of unexpected war types added by special situations or mods could be useful?

I think the issue is that the mod is trying to use the old declareWar function, which no longer exists. They'll need to be recompiled for the new war of declaring war. I didn't realise I'd changed it enough for it to require a mod recompile

I am using mods, and what you said would explain the issue.

Bobby, do you think some kind of announcement should be made to modders about this? Having mods subtly block savegames from progressing after some turns pass ingame until each one of them that uses war declarations fixes their code is troublesome.

Originally posted by crawlers:

Bobby, do you think some kind of announcement should be made to modders about this? Having mods subtly block savegames from progressing after some turns pass ingame until each one of them that uses war declarations fixes their code is troublesome.

Done