RenanPisi It's possible that Avast updated recently too, and the timing here is a coincidence. It's also possible that the crashes weren't affecting your game until now for one reason or another.
Somewhat more likely is that Avast is objecting to something that changed in the update. This has happened before on several occasions, and while most AV publishers sort this out relatively quickly, that doesn't help you if the AV can't update or somehow broke in the process.
It is of course possible that these crashes have nothing to do with the Sims 4 issues, so please let me know if temporarily removing Avast doesn't help.