Disable Font Size for Authors using: add_theme_support(‘disable-custom-font-sizes’);

Rather than messing with the theme code which might change should there be an update, why don’t you disable the capability of the role in regards to your stated problem?

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)