Three paths.

This is a map issue! I reinstalled the game, but the saves still crash.

Saves contain data about the map and mods (map mods, etc.) at the time of saving. To ensure everything works correctly, you need to start the game from scratch or revert the game, map version (specifically the version that was used when the save was created, not just any other version), mods, map mods, etc., back to how they were when the save was made. If even a small detail doesn't match, a crash may occur.

For example, some common errors:
1) The game was started with map version 1.0, but the save is loaded in version 1.1;
2) The game was started with a mod, but the save is loaded with a new version of the mod or without the mod at all.

Please upload the save file to the forum so we can test it.