如何在类-wc-cart.php中禁用异常？

Question

如何添加到购物车商品缺货？ 例外情况是class-wc-cart.php中的例外：

// Stock check - only check if we're managing stock and backorders are not allowed
            if ( ! $product_data->is_in_stock() ) {
                throw new Exception( sprintf( __( 'You cannot add "%s" to the cart because the product is out of stock.', 'woocommerce' ), $product_data->get_name() ) );
            }

我在尝试：

add_filter( 'woocommerce_add_to_cart_validation', 'woocommerce_add_cart_item_data_custom',5,6 );

function woocommerce_add_cart_item_data_custom( $product_id, $quantity, $variation_id, $variation, $cart_item_data) {
$product_data = wc_get_product( $product_id );
    $cart_item_data = (array) apply_filters( 'woocommerce_add_cart_item_data', $cart_item_data, $product_id, $variation_id );
    $cart_id        = WC()->cart->generate_cart_id( $product_id, $variation_id, $variation, $cart_item_data );
    $cart_item_key  = WC()->cart->find_product_in_cart( $cart_id );

    // Stock check - only check if we're managing stock and backorders are not allowed
            if ( ! $product_data->is_in_stock() ) {
                continue;
            }
    return false;
}

但不工作！请帮忙!!!