[2023] [19:28:42][eventtarget.cpp:2341]: Undefined event target: shroud_country, location: file: events/nemesis_crisis_endgame.txt line: 862 error

Stellar147 said: I have turned off all mods.

Disabling mods does not remove effects they have already had on the save game file.
Do you also get this in a galaxy that's never had any mods used in it?

If so, how are you determining your crash is related to that particular error? It is quite common for lines in error.log to show cosmetic errors.