NullReferenceException in FormItem 0.18.2

[michaelcsikos]

With 0.18.2 we are getting the following crash:

System.NullReferenceException: Object reference not set to an instance of an object.
   at AntDesign.FormItem.<BuildRenderTree>b__128_1(RenderTreeBuilder __builder3)
   at AntDesign.Col.BuildRenderTree(RenderTreeBuilder __builder)
   at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment, Exception& renderFragmentException)

We have rolled back to 0.18.1 for now.

[ElderJames]

We have fixed this issue in 0.18.3. Please try.

[michaelcsikos]

I did, but we're using AntDesign.ProLayout as well, and there's no update yet.

[michaelcsikos]

It still crashes with AntDesign 0.18.3 and AntDesign.ProLayout 0.18.2.

[ElderJames]

How did you use Form that would cause this issue?

[michaelcsikos]

We have a Sider with Tabs, then in a tab we have a FormItem with an edit component with edit controls (mostly sliders for numbers and InputNumber).

[LuukGlorie]

I'm also having the same issue when using a FormItem inside a FormItem. I don't think that's the right way to use it, so I changed that.
The error is actually thrown from:

ant-design-blazor/components/form/FormItem.razor.cs

Line 187 in 5b40649

private AntLabelAlignType? FormLabelAlign => LabelAlign ?? Form.LabelAlign;

So I think changing this to private AntLabelAlignType? FormLabelAlign => LabelAlign ?? Form?.LabelAlign; will fix the issue.

[ElderJames]

@LuukGlorie Thank you for figuring this,would you please send a PR for it?