BasketBuilder::fillFUser

public function fillFUser()
{
	$basket = $this->getBasket();
	if ($basket && !$basket->getFUserId(true))
	{
		$fuserId = null;

		$order = $this->getOrder();
		if ($order && $order->getUserId())
		{
			$fuserId = Fuser::getUserIdById($order->getUserId());
		}

		$basket->setFUserId(
			$fuserId ?: Fuser::getId(false)
		);
	}

	return $this;
}