Umbraco commerce shipping methods cannot be created via uSync

[FrontisFrank]

Describe the bug
When usync tries to create a new shipping method from a usync file the import fails with a null pointer reference exception. Updating an existing shipping method via usync seems to work fine.
Sidenote, creating a shipping method via usync import does work if the shippingmethod is not assigned any price. If the shipping method does have prices on creation the import fails, see both attached files.

Version (please complete the following information):

• Umbraco Version: 13.2.2
• uSync.Complete Version: 13.1.3
• uSync.Umbraco.Commerce Version: 12.0.0-rc2

To Reproduce
Steps to reproduce the behavior:

1. Create a shipping method in Umbraco Commerce with a default price
2. Make sure the usync file is exported
3. Try to import the shipping method on a machine where the shipping method does not yet exist
4. A null pointer reference exception is triggered and the shipping method is not created by usync

Expected behavior
When importing a new shipping method via uSync the shipping method must be succesfully created.

Screenshots
Not able to create via usync:

Able to create via usync: