Edit File: NullSubscriber.php
<?php namespace WP_Rocket\ThirdParty; use WP_Rocket\Event_Management\Subscriber_Interface; /** * Null Subscriber. * * Provides a base class to extend for common Subscribers. * * @since 3.6.3 */ class NullSubscriber implements Subscriber_Interface { /** * Get an array of subscribed events. * * To be overloaded with actual subscribed events in extending Subscribers. * * @since 3.6.3 * * @return array */ public static function get_subscribed_events() { return []; } }