Error when calling GetOrCreateCurrentOrderAsync after upgrading from v14 to v15

[jwolke]

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)

15.3.4

Bug summary

I recently upgraded from v14.1.5 to v15.4.1 of Umbraco Commerce and I am running into an issue in the CartSurfaceController code that I copied from the Demo Store. I am encountering the following error on this line of code:

var order = await _commerceApi.GetOrCreateCurrentOrderAsync(store.Id) .AsWritableAsync(uow);

Error:

System.NullReferenceException
HResult=0x80004003
Message=Object reference not set to an instance of an object.
Source=Umbraco.Commerce.Web
StackTrace:
at Umbraco.Commerce.Web.Session.CookieSessionStore.GetValue[T](String key)
at Umbraco.Commerce.Core.Session.SessionManager.<>c__DisplayClass43_0.<b__0>d.MoveNext()
at Umbraco.Commerce.Core.Session.SessionManager.d__1011.MoveNext() at Umbraco.Commerce.Core.Session.SessionManager.<>c__DisplayClass56_0.<<GetDefaultShippingMethodAsync>b__0>d.MoveNext() at Umbraco.Commerce.Core.Session.SessionManager.<WithSessionStoreAsync>d__1011.MoveNext()
at Umbraco.Commerce.Core.Session.SessionManager.<>c__DisplayClass14_0.<b__1>d.MoveNext()
at Umbraco.Commerce.Core.UmbracoCommerceUnitOfWorkProvider.d__221.MoveNext() at Umbraco.Commerce.Core.UmbracoCommerceUnitOfWorkProvider.<ExecuteWithUnitOfWorkAsync>d__221.MoveNext()
at Umbraco.Commerce.Core.Session.SessionManager.d__14.MoveNext()
at Umbraco.Commerce.Core.Session.SessionManager.d__13.MoveNext()
at Umbraco.Commerce.Extensions.AggregateBaseExtensions.d__7.MoveNext()
at GeneTools.Core.Web.Controllers.CartSurfaceController.<>c__DisplayClass2_0.<b__0>d.MoveNext() in C:\dev\genetools\src\GeneTools.Core\Web\Controllers\CartSurfaceController.cs:line 36

This exception was originally thrown at this call stack:
[External Code]
GeneTools.Core.Web.Controllers.CartSurfaceController.AddToCart.AnonymousMethod__0(Umbraco.Commerce.Common.IUnitOfWork) in CartSurfaceController.cs

We are using the same code as the demo store. Based on my debugging, the error seems to happen in the GetCurrentAdminOrderAsync() method of the Umbraco.Commerce.Core.Session::SessionManager.cs class

When I switch to using the Result rather than awaiting the call to GetOrCreateCurrentOrderAsync, everything works as expected:

var order = _commerceApi.GetOrCreateCurrentOrderAsync(store.Id).AsWritableAsync(uow).Result;

Specifics

No response

Steps to reproduce

TBD

Expected result / actual result

No response

Dependencies

No response