NULL Reference Exception binding empty property

Hi Guys,

first of all, i have to mention, that you are doing a great job here. I love to use Radzen in my Blazor projects.
Now i ran in to a issue, i dont understand. I have a List of objects from a Database, EFCore, with a foreign key property, that is nullable. When i load this to an dropdown in a form with filled foreign id, all is good. Empty form is also ok. But when i load object with empty property it came to a null reference exception.

<RadzenDropDown @bind-Value="@dialogProperty.EntityDataTypeId"
AllowFiltering="true"
Placeholder="Auswählen..."
TValue="string"
Data="@entityDataTypes"
TextProperty="Name"
ValueProperty="Id">

I use Visual Studio 2019 Community Latest and the App is an Blazorserver on NETCore 3.1. Radzen Nuget is 2.1.18.

What do i wrong?
Thanks in advance for the help.

Maybe your first question would be on the detailed error message:

System.NullReferenceException
HResult=0x80004003
Nachricht = Object reference not set to an instance of an object.
Quelle = RadzenTest
Stapel√ľberwachung:
at RadzenTest.Pages.PageListEntityProperties.<>c__DisplayClass0_0.b__3(RenderTreeBuilder __builder3)

is most probably null

Forget it ... sorry, i'm a idiot ... i found the problem on an other part of the component.
Thanks anyway.