@serosflatass
This may be due to outdated mods and custom content.
Try moving your mods folder to the desktop and deleting the localthumbcache.package from the Sims 4 folder to help with troubleshooting.
How to Delete Cache Files - https://sims4.crinrict.com/en/2014/09/delete-cache-files/
Deleting the cache files will remove all traces of mods and custom content that were tied to your game.
Launch the game again and try a new save to test - without the mods folder. If it loads and plays okay, it may be that some of the mods/cc have become outdated. If it's not working, don't save.
Testing like this will help determine if it's a mod issue, cc issue or a vanilla game issue. - Disabling or turning off both mod/cc options isn't enough of a test.
To fix mods and custom content try the 50/50 method:
1. Move all the mods and cc out into a temporary folder on the desktop.
2. Move a few files back at a time. Load the game to make sure it loads and everything is good.
3. Delete the localthumbcache.package from the Sims 4 folder.
4. Repeat steps 1 - 3 till there is no more files to check.
** While your testing, don't save the game. If you find any problems, delete the mod or custom content file.
How To Find Problem Mods and CC - http://simswiki.info/wiki.php?title=Game_Help:TS4_Finding_Problem_Custom_Content
Broken/Updated Mods: Python/Terrain Update + Get Famous, Nov. ’18 - https://forums.thesims.com/en_US/discussion/950909/broken-updated-mods-python-terrain-update-get-famous-nov-18
