TemplatedCell.UpdateSelectionColor() Object reference not set to an instance of an object error

[sencagri]

Description

After updating 8.0.7 I get this error on only iOS platform, android is working fine.

14:08:14:823	[0:] An error occurred: 'Object reference not set to an instance of an object.'. Callstack: '   at Microsoft.Maui.Controls.Handlers.Items.TemplatedCell.UpdateSelectionColor()
14:08:14:823	   at Microsoft.Maui.Controls.Handlers.Items.TemplatedCell.set_Selected(Boolean value)
14:08:14:823	   at UIKit.UICollectionView.DequeueReusableCell(NSString reuseIdentifier, NSIndexPath indexPath) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/build/dotnet/ios/generated-sources/UIKit/UICollectionView.g.cs:line 232
14:08:14:823	   at UIKit.UICollectionView.DequeueReusableCell(String reuseIdentifier, NSIndexPath indexPath) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UICollectionView.cs:line 23
14:08:14:823	   at Microsoft.Maui.Controls.Handlers.Items.ItemsViewController`1[[Microsoft.Maui.Controls.ReorderableItemsView, Microsoft.Maui.Controls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].GetCell(UICollectionView collectionView, NSIndexPath indexPath)
14:08:14:823	   at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:line 58
14:08:14:823	   at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:line 94
14:08:14:823	   at AktifBarkod.AktifPOS.Mobil.Program.Main(String[] args) in E:\AktifPOS\AktifBarkod.AktifPOS.Mobil\Platforms\iOS\Program.cs:line 13
14:08:14:823	   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
14:08:14:823	   at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)'
14:08:15:213	The app has been terminated.

Steps to Reproduce

No response

Link to public reproduction project repository

No response

Version with bug

8.0.7 SR2

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

8.0.6 SR1

Affected platforms

iOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

No response

[ghost]

Hi @sencagri. We have added the "s/needs-repro" label to this issue, which indicates that we require steps and sample code to reproduce the issue before we can take further action. Please try to create a minimal sample project/solution or code samples which reproduce the issue, ideally as a GitHub repo that we can clone. See more details about creating repros here: https://github.com/dotnet/maui/blob/main/.github/repro.md

This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[sencagri]

Is there any clue about the issue our project is fairly complex and I don't know where the problem is. Kinda hard to create a repro.

[PureWeen]

@filipnavara thoughts?

Do you think this could be related to?
#14619

[PureWeen]

@filipnavara thoughts?

Do you think this could be related to? #14619

Never mind, your PR is going into SR3 not SR2

@sencagri if you test the nightly does that fix?

https://github.com/dotnet/maui/wiki/Nightly-Builds

[PureWeen]

Duplicate of #20606