Dynamic Priced Shipping Method causing a NRE when updating order

[Rian-BG]

Which component is this issue related to?

Umbraco Commerce (Core)

Which Umbraco Commerce version are you using? (Please write the exact version, example: 10.1.0)

13.2.2

Bug summary

When selecting a Dynamic Shipping Method configured purely via the back office (no custom calculator code), checkout fails with a NullReferenceException.
Flat-rate shipping methods work without issue — only dynamic shipping methods trigger the error.

Code being called:

_commerceApi.Uow.Execute(uow =>
            {
                var store = _settingsService.GetStore();
                var order = _commerceApi.GetOrCreateCurrentOrder(store.Id)
                    .AsWritable(uow)
                    .SetShippingMethod(shippingMethodId);

                _commerceApi.SaveOrder(order);

                uow.Complete();
            });

Specifics

• No custom shipping calculator implemented
• Dynamic rate created according to official documentation
• Order currency & shipping address present and valid
• ShippingMethodId is correctly assigned to the order on update
• Only difference between working and failing shipping methods: Dynamic vs Flat

Steps to reproduce

1. Create a Dynamic Shipping Method via back office:

Add valid pricing rules/bands
Save & publish

2. Add product to cart and proceed to checkout
3. Select the Dynamic Priced Shipping method and submit form/trigger update of order shipping method/continue with checkout flow
4. NRE thrown during _api.SaveOrder(order)

Expected result / actual result

Expected Result
Order is updated with the correct shipping method and pricing, and no errors are thrown/checkout flow continues as expected

Actual Result
A NullReferenceException is thrown when updating the shipping method

Dependencies

No response

[acoumb]

Hi @Rian-BG ,

I've tried replicating this on our demo store, but the checkout process went through successfully.
Could you share some details on your dynamic shipping method configuration, the defined ranges?

Thanks,
Adrian

[Rian-BG]

Hey @acoumb

Thanks for getting back to me so soon.

Please see below the rates set:

I also did test it with only a 1 - Unbound range, assuming that would act as a catch-all.

[acoumb]

@Rian-BG could you provide the entire configuration (SKU, Countries) of the shipping method config, maybe also the controller action you use?