Removing widget in child theme

Hi, I’m trying to disable the google maps widget since it enter in confilt with the plugin advanced custom fields.

I follow the intruction for this thread https://kriesi.at/support/topic/is-it-possible-to-remove-unneeded-features/

function avia_register_avia_widgets()
{
    register_widget( 'avia_newsbox' );
    register_widget( 'avia_portfoliobox' );
    register_widget( 'avia_socialcount' );
    register_widget( 'avia_combo_widget' );
    register_widget( 'avia_partner_widget' );
    register_widget( 'avia_fb_likebox' );
    register_widget( 'avia_instagram_widget' );
}
avia_register_avia_widgets();

But I get this error Fatal error: Class 'avia_newsbox' not found in /wp-includes/class-wp-widget-factory.php on line 57

I’m using a child theme. I put the confliting widget in comment in the parent theme for now but I might forget it when the next update will come.