System.InvalidOperationException: Sequence contains no elements
at System.Linq.ThrowHelper.ThrowNoElementsException()
at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
at NPS.Web.Components.Pages.Product.LoadProductAndVariant() in D:\workspace\1c7ac8fbfa3f9bb4\hostexecutor\NPS.Web\Components\Pages\Product.razor:line 38
at The.Web.Controls.BoundTask`1..MoveNext()