Cannot call method isTracked() on Sylius\Component\Core\Model\ProductVariantInterface|null.

Cannot call method getOnHold() on Sylius\Component\Core\Model\ProductVariantInterface|null.

Only numeric types are allowed in -, int|null given on the left side.

Cannot call method getName() on Sylius\Component\Core\Model\ProductVariantInterface|null.

Parameter #1 $variantName of class Sylius\Component\Core\Inventory\Exception\NotEnoughUnitsOnHoldException constructor expects string, string|null given.

Cannot call method getOnHold() on Sylius\Component\Core\Model\ProductVariantInterface|null.

Cannot call method setOnHold() on Sylius\Component\Core\Model\ProductVariantInterface|null.

Only numeric types are allowed in -, int|null given on the left side.

Cannot call method isTracked() on Sylius\Component\Core\Model\ProductVariantInterface|null.

Cannot call method getOnHand() on Sylius\Component\Core\Model\ProductVariantInterface|null.