Customizer chokes on my theme in 4.9, where should I be looking?

I found the line of code in my theme that is breaking the customizer in 4.9. Behold!

$wp_customize->remove_setting( 'header_textcolor' );

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