add_filter( 'is_active_sidebar', function( $is_active_sidebar, $index ) {

	global $wp_registered_widgets;
	$widgets = wp_get_sidebars_widgets();

	$widget_area_contents = $widgets[ $index ];
	$active_widget_count = count( $widget_area_contents );

	foreach ( $widgets[ $index ] as $widget_instance ) {

		if ( ! array_key_exists( $widget_instance, $wp_registered_widgets ) ) {
			$active_widget_count--;
		}
	}
	return ( 0 < $active_widget_count );
}, 10 , 2);