WooCommerce add an Empty Cart button

functions.php

<?php
// check for empty-cart get param to clear the cart
add_action( 'init', 'woocommerce_clear_cart_url' );
function woocommerce_clear_cart_url() {
    global $woocommerce;

    if ( isset( $_GET['empty-cart'] ) ) {
        $woocommerce->cart->empty_cart();
    }
}

add_action( 'woocommerce_cart_actions', 'patricks_add_clear_cart_button', 20 );
function patricks_add_clear_cart_button() {
    echo "<a class='button' href='?empty-cart=true'>" . __( 'Empty Cart', 'woocommerce' ) . "</a>";
} 

hmm. works flawless with user logged in here. how come? Wocommerce 3.3.3