Just add redux global variable between funtion
add_filter ('add_to_cart_redirect', 'redirect_to_checkout');
function redirect_to_checkout() {
global $xpanel; if ( isset( $xpanel['woo-option'] ) && $xpanel['woo-option'] == TRUE ) {
global $woocommerce;
$checkout_url = $woocommerce->cart->get_checkout_url();
return $checkout_url;
}
}