[BUG] ceil(): null given from OrderItemInterface::getDefaultUnitQuantity()

[gander]

TypeError: ceil(): Argument #1 ($num) must be of type int|float, null given in vendor/coreshop/core-shop/src/CoreShop/Component/Core/Inventory/Operator/OrderInventoryOperator.php:64

Where

\CoreShop\Component\Core\Inventory\Operator\OrderInventoryOperator::hold

$product->setOnHold($product->getOnHold() + (int) ceil($orderItem->getDefaultUnitQuantity()));

What:

ceil($orderItem->getDefaultUnitQuantity())

\CoreShop\Component\Core\Model\OrderItemInterface::getDefaultUnitQuantity(): ?float;