[2022] Consistent crash to desktop with Unhandled Exception C0000005 (EXCEPTION_ACCESS_VIOLATION) on 01/01/1110 in-game time

Is this in a new campaign started since the 1. patch? Because campaigns from previous patches will not be playable under 1.6 I am sure, you'd need to revert to 1.5.1 to continue them.

And if there are any mods involved, they can't be used under 1.6 until their authors update them.