.net 9 maui Shell.Current.GotoAsync("..") app crash with debugger is attached exception on windows when back from a page that implements map control

[MahmoudAlEssawi]

Description

After upgrading to .net 9
and CommunityToolkit.Maui.Maps nuget to 2.0.4

when navigating back from a page that implements a map control

this happens on windows only

#if DEBUG && !DISABLE_XAML_GENERATED_BREAK_ON_UNHANDLED_EXCEPTION
UnhandledException += (sender, e) =>
{
if (global::System.Diagnostics.Debugger.IsAttached) global::System.Diagnostics.Debugger.Break();
};
#endif

Steps to Reproduce

setup the CommunityToolkit.Maui.Maps nuget version: 2.0.4

Create a page.

add map control,

run on Windows machine

try navigating to this page then navigate back.

Link to public reproduction project repository

No response

Version with bug

9.0.10 SR1

Is this a regression from previous behavior?

No, this is something new

Last version that worked well

8.0.91 SR9.1

Affected platforms

Windows

Affected platform versions

Windows 11

Did you find any workaround?

No

Relevant log output

[FaithfulDev]

Link to public reproduction project repository:
https://github.com/FaithfulDev/MapGoBackBugMinimal

I'm getting this exception:

PlatformView cannot be null here

at Microsoft.Maui.Handlers.ViewHandler`2.get_PlatformView()
at CommunityToolkit.Maui.Maps.Handlers.MapHandlerWindows.DisconnectHandler(FrameworkElement platformView)
at Microsoft.Maui.Handlers.ViewHandler`2.OnDisconnectHandler(FrameworkElement platformView)
at Microsoft.Maui.Handlers.ViewHandler.OnDisconnectHandler(Object platformView)
at Microsoft.Maui.Handlers.ElementHandler.DisconnectHandler(Object platformView)
at Microsoft.Maui.Handlers.ElementHandler.Microsoft.Maui.IElementHandler.DisconnectHandler()
at Microsoft.Maui.ViewExtensions.DisconnectHandlers(IView view)
at Microsoft.Maui.Controls.Page.<SendNavigatedFrom>b__111_0()
at Microsoft.Maui.Platform.FrameworkElementExtensions.<>c__DisplayClass11_0.<OnUnloaded>b__2(Object _, RoutedEventArgs __)
at WinRT._EventSource_global__Microsoft_UI_Xaml_RoutedEventHandler.EventState.<GetEventInvoke>b__1_0(Object sender, RoutedEventArgs e)
at ABI.Microsoft.UI.Xaml.RoutedEventHandler.Do_Abi_Invoke(IntPtr thisPtr, IntPtr sender, IntPtr e)

Is this your exception as well?

[FaithfulDev]

It's probably better for you to ask in the Community Toolkit Maui project for help:
https://github.com/CommunityToolkit/Maui

[MahmoudAlEssawi]

Link to public reproduction project repository: https://github.com/FaithfulDev/MapGoBackBugMinimal

I'm getting this exception:

PlatformView cannot be null here

at Microsoft.Maui.Handlers.ViewHandler`2.get_PlatformView()
at CommunityToolkit.Maui.Maps.Handlers.MapHandlerWindows.DisconnectHandler(FrameworkElement platformView)
at Microsoft.Maui.Handlers.ViewHandler`2.OnDisconnectHandler(FrameworkElement platformView)
at Microsoft.Maui.Handlers.ViewHandler.OnDisconnectHandler(Object platformView)
at Microsoft.Maui.Handlers.ElementHandler.DisconnectHandler(Object platformView)
at Microsoft.Maui.Handlers.ElementHandler.Microsoft.Maui.IElementHandler.DisconnectHandler()
at Microsoft.Maui.ViewExtensions.DisconnectHandlers(IView view)
at Microsoft.Maui.Controls.Page.<SendNavigatedFrom>b__111_0()
at Microsoft.Maui.Platform.FrameworkElementExtensions.<>c__DisplayClass11_0.<OnUnloaded>b__2(Object _, RoutedEventArgs __)
at WinRT._EventSource_global__Microsoft_UI_Xaml_RoutedEventHandler.EventState.<GetEventInvoke>b__1_0(Object sender, RoutedEventArgs e)
at ABI.Microsoft.UI.Xaml.RoutedEventHandler.Do_Abi_Invoke(IntPtr thisPtr, IntPtr sender, IntPtr e)

Is this your exception as well?

Visual studio doesn't generate any log report for the exception. just crash with debugger is attached

[FaithfulDev]

Visual studio doesn't generate any log report for the exception. just crash with debugger is attached

When your Debugger stops at System.Diagnostics.Debugger.Break(); in the UnhandledException event handler, you can inspect the event args e to see the exception that was unhandled.

[MahmoudAlEssawi]

Thanks for your help:

Yes the error is the same as you get:

PlatformView cannot be null here

at Microsoft.Maui.Handlers.ViewHandler2.get_PlatformView() at CommunityToolkit.Maui.Maps.Handlers.MapHandlerWindows.DisconnectHandler(FrameworkElement platformView) at Microsoft.Maui.Handlers.ViewHandler2.OnDisconnectHandler(FrameworkElement platformView)
at Microsoft.Maui.Handlers.ViewHandler.OnDisconnectHandler(Object platformView)
at Microsoft.Maui.Handlers.ElementHandler.DisconnectHandler(Object platformView)
at Microsoft.Maui.Handlers.ElementHandler.Microsoft.Maui.IElementHandler.DisconnectHandler()
at Microsoft.Maui.ViewExtensions.DisconnectHandlers(IView view)
at Microsoft.Maui.Controls.Page.b__111_0()
at Microsoft.Maui.Platform.FrameworkElementExtensions.<>c__DisplayClass11_0.b__2(Object _, RoutedEventArgs __)
at WinRT._EventSource_global__Microsoft_UI_Xaml_RoutedEventHandler.EventState.b__1_0(Object sender, RoutedEventArgs e)
at ABI.Microsoft.UI.Xaml.RoutedEventHandler.Do_Abi_Invoke(IntPtr thisPtr, IntPtr sender, IntPtr e)

[MahmoudAlEssawi]

I created an issue in the community toolkit as it related to it.
#2366

[kevinxufei]

I can repro this issue at Windows platform on the latest 17.13 Preview 1(9.0.0 & 9.0.100),but the PlatformView cannot be null exception does not exist in 8.0.91 & 8.0.100.

[tj-devel709]

Thanks for creating this issue. Since there is an issue created in the Maui Community Toolkit above, I will close this one here. If this is not resolved with the Maui Community Toolkit, feel free to reopen this issue or create a new one and link this issue there.