pyramidengarten-berlin/wp-themes/generatepress/inc/customizer/controls/js/upsell-control.js

( function( $, api ) {
	api.sectionConstructor['gp-upsell-section'] = api.Section.extend( {

		// No events for this type of section.
		attachEvents: function () {},

		// Always make the section active.
		isContextuallyActive: function () {
			return true;
		}
	} );
} )( jQuery, wp.customize );