Hi NathTheLeaf
this looks like some kind of corruption. Have you also tried a clean folder: https://forums.ea.com/kb/the-sims-helpers-blog-en/troubleshooting-clean-user-folder-approach/12690428
Just put a copy of your save back (you will loose all cc on the save but since you created a backup you can go back to that afterwards) and see if the same error occurs, then report back.
- Do you have any LastException files in Documents\Electronic Arts\The Sims 4 ?
- Delete the ones you have
- Trigger the error again
- Check if new ones are created
- If that is the case, please copy/paste the content here. You can open the file with any text editor.
Deleting the file won't fix your issue. Posting the info is meant for troubleshooting.