sims 4 error code 300:6812b4a0:2672b1b1

Scruffyxlookinn Is this with or without mods/cc ? What platform are you playing on ?

with mods and cc, playing on pc

Scruffyxlookinn Please move your mods folder to the desktop, delete Documents > Electronic Arts > The Sims 4 > localthumbcache, repair your game and then try again on a backup of your save to see of you can duplicate the issue on a game with no mods.