Thank you guys! Everything ok!
In casi this helps anyone.
The easiest way to fix this, since we cannot access the wordpress panel in order to update theme, and in case someone doesnt have FTP, you can fix it super fast with your cPanel or similar this way:
Download from WordPress the new updated theme to your desktop
unzip
Enter your cPanel Brasserie theme files.
Go as far as the INC folder
Upload only the customizer.php file (the one that was causing the error)
Go to your site and refresh
You should be able to sign in now.
Go to the theme update and update.
Voilá
Byyye!