pmpro woocommerce add on

Hi, i have used this code to use woocommerce checkout instead of pmpro checkout. However if the cart is empty the user is unable to finish the checkout. The code is only working if there is an item in the cart already* add_action('template_redirect','pmpro_woocommerce_redirect_checkout'); function pmpro_woocommerce_redirect_checkout(){ $id = get_option('pmpro_checkout_page_id'); global $post; if($post->ID == $id && !empty($_REQUEST['level'])){ global $wpdb; $product_id = $wpdb->get_var($wpdb->prepare("SELECT post_id FROM {$wpdb->postmeta} WHERE meta_key = %s AND meta_value = %d",'_membership_product_level',$_REQUEST['level'])); if(!empty($product_id)){ $checkout_url = WC()->cart->get_checkout_url(); if ( sizeof( WC()->cart->get_cart() ) > 0 ) { foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) { $_product = $values['data']; if ( $_product->id == $product_id ) $found = true; } // if product not found, add it if ( ! $found ) WC()->cart->add_to_cart( $product_id ); wp_redirect( $checkout_url);
}else{ // if no products in cart, add it WC()->cart->add_to_cart( $product_id ); wp_redirect( $checkout_url);
} exit(); } } }