To me that looks like a library call, and I doubt you’ve gone through the ADKs library assets and meddled with them, that stuff should not even be accessible by the ADK. That being said it would mean something that is calling that library has bad data, as there is not always a chain of custody on memory, so if you pass bad information to another section it can crash completely valid library functions.
As I’ve made quite a few mods without ever experiencing this particular issue I can’t give you specific information, and as it’s a library call and not a local file call from your mod it’s further making it hard to just tell you what your issue is. ADK has a tendency to revert your changes if you scroll off screen, and it could be possible it’s passing a null field to a library and the library is not set to handle null.
If you make a new simple mod that has nothing in it, except a UMap, PrimalGameData & TestGameMode. Link them all properly, change their description and mod name, cook & upload. Test it, if it doesn’t have a library crash, you know that there is a fault with 1 part of your mod, slowly build your mod back up piece by piece until the issue is resolved or you find the part of your mod that had issues.