rocket-fix-polylang-term-bug.php

<?php
defined( 'ABSPATH' ) or die();
/**
 * Plugin Name: WP Rocket | Fix Polylang conflict
 * Description: Prevent warning when adding a new translation with Polylang
 * Author:      WP Rocket Support Team
 * Author URI:  https://wp-rocket.me/
 * License:     GNU General Public License v3 or later
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
 */

function wp_rocket_fix_polylang_term_bug() {
	remove_action( 'create_term', 'rocket_clean_domain' );
	add_action( 'create_term', 'wp_rocket_create_term_clean_domain' );
}
add_action( 'wp_rocket_loaded', 'wp_rocket_fix_polylang_term_bug' );

function wp_rocket_create_term_clean_domain() {
	rocket_clean_domain();
}