System.ObjectDisposedException: Cannot access a disposed object. Object name: ''DefaultRenderer' iOS

Question

System.ObjectDisposedException: Cannot access a disposed object. Object name: ''DefaultRenderer' iOS

Bindresh Kumar 6

Hi Team,

I need your help to fix this issue. I am struggling since 3-4 days but no luck :( . I am getting this Exception in Xamarin forms project when I am trying to launch my MasterDetail page from login page in iOS. However this is working fine in Android. I am using the latest Xamarin forms version 4.8.0.1821.

Here are the lines of code where app is crashing.

masterDetail.Detail = new SeritiNavigationPage(new HealthAndSafetyView());
App.Current.MainPage = masterDetail; The app is crashing in this line.

For navigation I am using ViewModelNavigation pattern. The same code is working fine with android version.

Exception Log:
Unhandled Exception:
System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'DefaultRenderer'.
at Foundation.NSObject.get_SuperHandle () [0x00012] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSObject2.cs:394
at UIKit.UIView.RemoveFromSuperview () [0x00023] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/UIKit/UIView.g.cs:1476
at Xamarin.Forms.Platform.iOS.NavigationRenderer+Container.Dispose (System.Boolean disposing) [0x00031] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:1707
at Foundation.NSObject.Dispose () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSObject2.cs:144
at Xamarin.Forms.Platform.iOS.NavigationRenderer+ParentingViewController.Dispose (System.Boolean disposing) [0x0007e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:1132
at Foundation.NSObject.Dispose () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSObject2.cs:144
at Xamarin.Forms.Platform.iOS.NavigationRenderer.Dispose (System.Boolean disposing) [0x0002f] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:264
at Foundation.NSObject.Dispose () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSObject2.cs:144
at Xamarin.Forms.Platform.iOS.DisposeHelpers.DisposeModalAndChildRenderers (Xamarin.Forms.Element view) [0x000a0] in D:\a\1\s\Xamarin.Forms.Platform.iOS\DisposeHelpers.cs:43
at Xamarin.Forms.Platform.iOS.Platform.CleanUpPages () [0x00017] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:673
at Xamarin.Forms.Platform.iOS.PlatformRenderer.Dispose (System.Boolean disposing) [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\PlatformRenderer.cs:121
at Foundation.NSObject.Dispose () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSObject2.cs:144
at Xamarin.Forms.Platform.iOS.Platform.Dispose (System.Boolean disposing) [0x00013] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:75
at Xamarin.Forms.Platform.iOS.Platform.System.IDisposable.Dispose () [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:61
at Xamarin.Forms.Platform.iOS.FormsApplicationDelegate.UpdateMainPage () [0x00022] in D:\a\1\s\Xamarin.Forms.Platform.iOS\FormsApplicationDelegate.cs:200
at Xamarin.Forms.Platform.iOS.FormsApplicationDelegate.ApplicationOnPropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs args) [0x00012] in D:\a\1\s\Xamarin.Forms.Platform.iOS\FormsApplicationDelegate.cs:152
at Xamarin.Forms.BindableObject.OnPropertyChanged (System.String propertyName) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:229
at Xamarin.Forms.Element.OnPropertyChanged (System.String propertyName) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Element.cs:353
at Xamarin.Forms.Application.set_MainPage (Xamarin.Forms.Page value) [0x0008b] in D:\a\1\s\Xamarin.Forms.Core\Application.cs:93
at SeritiVisitorApp.Services.Navigation.NavigationService.InternalNavigateToAsync (System.Type viewModelType, System.Object parameter) [0x000cc] in /Users/user183880/Downloads/SeritiVisitorApp-2/SeritiVisitorApp/SeritiVisitorApp/SeritiVisitorApp/Services/Navigation/NavigationService.cs:106
at SeritiVisitorApp.ViewModels.LoginViewModel.SignInAsync () [0x00447] in /Users/user183880/Downloads/SeritiVisitorApp-2/SeritiVisitorApp/SeritiVisitorApp/SeritiVisitorApp/ViewModels/LoginViewModel.cs:69
at SeritiVisitorApp.ViewModels.LoginViewModel.b__6_0 () [0x0001f] in /Users/user183880/Downloads/SeritiVisitorApp-2/SeritiVisitorApp/SeritiVisitorApp/SeritiVisitorApp/ViewModels/LoginViewModel.cs:19
at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.b__7_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021
at Foundation.NSAsyncSynchronizationContextDispatcher.Apply () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSAction.cs:178
--- End of stack trace from previous location where exception was thrown ---

at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:86
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0000e] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:65
at SeritiVisitorApp.iOS.Application.Main (System.String[] args) [0x00001] in /Users/user183880/Downloads/SeritiVisitorApp-2/SeritiVisitorApp/SeritiVisitorApp/SeritiVisitorApp.iOS/Main.cs:12
2021-01-05 00:46:52.140166-0800 SeritiVisitorApp.iOS[38377:676980] Unhandled managed exception: Cannot access a disposed object.
Object name: 'DefaultRenderer'. (System.ObjectDisposedException)
at Foundation.NSObject.get_SuperHandle () [0x00012] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSObject2.cs:394
at UIKit.UIView.RemoveFromSuperview () [0x00023] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/UIKit/UIView.g.cs:1476
at Xamarin.Forms.Platform.iOS.NavigationRenderer+Container.Dispose (System.Boolean disposing) [0x00031] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:1707
at Foundation.NSObject.Dispose () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSObject2.cs:144
at Xamarin.Forms.Platform.iOS.NavigationRenderer+ParentingViewController.Dispose (System.Boolean disposing) [0x0007e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:1132
at Foundation.NSObject.Dispose () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSObject2.cs:144
at Xamarin.Forms.Platform.iOS.NavigationRenderer.Dispose (System.Boolean disposing) [0x0002f] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\NavigationRenderer.cs:264
at Foundation.NSObject.Dispose () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSObject2.cs:144
at Xamarin.Forms.Platform.iOS.DisposeHelpers.DisposeModalAndChildRenderers (Xamarin.Forms.Element view) [0x000a0] in D:\a\1\s\Xamarin.Forms.Platform.iOS\DisposeHelpers.cs:43
at Xamarin.Forms.Platform.iOS.Platform.CleanUpPages () [0x00017] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:673
at Xamarin.Forms.Platform.iOS.PlatformRenderer.Dispose (System.Boolean disposing) [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\PlatformRenderer.cs:121
at Foundation.NSObject.Dispose () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSObject2.cs:144
at Xamarin.Forms.Platform.iOS.Platform.Dispose (System.Boolean disposing) [0x00013] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:75
at Xamarin.Forms.Platform.iOS.Platform.System.IDisposable.Dispose () [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:61
at Xamarin.Forms.Platform.iOS.FormsApplicationDelegate.UpdateMainPage () [0x00022] in D:\a\1\s\Xamarin.Forms.Platform.iOS\FormsApplicationDelegate.cs:200
at Xamarin.Forms.Platform.iOS.FormsApplicationDelegate.ApplicationOnPropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs args) [0x00012] in D:\a\1\s\Xamarin.Forms.Platform.iOS\FormsApplicationDelegate.cs:152
at Xamarin.Forms.BindableObject.OnPropertyChanged (System.String propertyName) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:229
at Xamarin.Forms.Element.OnPropertyChanged (System.String propertyName) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Element.cs:353
at Xamarin.Forms.Application.set_MainPage (Xamarin.Forms.Page value) [0x0008b] in D:\a\1\s\Xamarin.Forms.Core\Application.cs:93
at SeritiVisitorApp.Services.Navigation.NavigationService.InternalNavigateToAsync (System.Type viewModelType, System.Object parameter) [0x000cc] in /Users/user183880/Downloads/SeritiVisitorApp-2/SeritiVisitorApp/SeritiVisitorApp/SeritiVisitorApp/Services/Navigation/NavigationService.cs:106
at SeritiVisitorApp.ViewModels.LoginViewModel.SignInAsync () [0x00447] in /Users/user183880/Downloads/SeritiVisitorApp-2/SeritiVisitorApp/SeritiVisitorApp/SeritiVisitorApp/ViewModels/LoginViewModel.cs:69
at SeritiVisitorApp.ViewModels.LoginViewModel.b__6_0 () [0x0001f] in /Users/user183880/Downloads/SeritiVisitorApp-2/SeritiVisitorApp/SeritiVisitorApp/SeritiVisitorApp/ViewModels/LoginViewModel.cs:19
at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.b__7_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021
at Foundation.NSAsyncSynchronizationContextDispatcher.Apply () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/Foundation/NSAction.cs:178
--- End of stack trace from previous location where exception was thrown ---

at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:86
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0000e] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:65
at SeritiVisitorApp.iOS.Application.Main (System.String[] args) [0x00001] in /Users/user183880/Downloads/SeritiVisitorApp-2/SeritiVisitorApp/SeritiVisitorApp/SeritiVisitorApp.iOS/Main.cs:12

=================================================================

Native Crash Reporting
Got a abrt while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.

Thanks,
Bindresh

JarvanZhang 23,971 Reputation points

2021-01-05T12:53:15.423+00:00

Hi,BindreshKumar-3047. What's the 'SeritiNavigationPage' page in the posted code? Did you use the third-party library? The detail page should only be populated with TabbedPage, NavigationPage, and ContentPage instances, check the doc.

Try using the NavigationPage for test instead to check if it'll work in your sample.
Bindresh Kumar 6 Reputation points

2021-01-05T13:07:31.057+00:00

Thanks Jarvan,

Here SeritiNavigationPage is just a partial class extending NavigationPage. I am not using any third party library here.
like this only public partial class SeritiNavigationPage : NavigationPage.

In android I have tested almost 7-8 different-2 devices with different os version but is working fine. But in iOS exception occurs as soon as I am trying to navigate from Login page to MasterDetailsPage.

If I am directly opening MasterDetailPage then also it is working as expected. Don't know why this is coming in iOS.

I hope this info helps you.

Regards,
Bindresh
JarvanZhang 23,971 Reputation points

2021-01-05T14:11:13.257+00:00

Hi, I created a basic sample to test the function with Xamarin forms version 4.8.0.1821, it works fine on iOS. Could you post a baisc demo on the github or onedrive, then share the link here? It'll help to reproduce the issue to get the cause.
Bindresh Kumar 6 Reputation points

2021-01-06T02:23:38.903+00:00

Thanks, I'll create a demo app from the same source code files of main project and share it with you.
JarvanZhang 23,971 Reputation points

2021-01-07T07:07:32.183+00:00

Waiting for your update.
Bindresh Kumar 6 Reputation points

2021-01-08T21:57:11.647+00:00

Hi Jarvan,

Sorry for the delay. Although I have fixed it in my running code by using some patch, But to replicate the crash, I have created a demo app and tried to replicate the crash in same way. It is still crashing.

"I think the reason of crash is, I am trying to navigate to MasterDetails page from a Navigation page". If you debug it in NavigationService class you will get the crash.

Demo Code link : https://we.tl/t-mz4VrIxKcP

Kindly let me know if you face any trouble in downloading the code.

Thanks,
Bindresh
JarvanZhang 23,971 Reputation points

2021-01-11T07:44:55.58+00:00

Hi, BindreshKumar-3047. I checked the code of the sample, it turns out that the project references the Autofac library. There may be confilts between the library with Xamarin.Forms, you could report this issue to the author of the Autofac library for help.
Bindresh Kumar 6 Reputation points

2021-01-11T08:29:51.137+00:00
Hi Jarvan,

Thanks for your feedback. I will check with the author of Autofac definitely. However there are few points I wanted to mention here. Kindly look into them and suggest.

I have tested and reproduced this crash on different -2 Xamarin forms versions 4.6 to 4.8. It was crashing in each version for ios.

In Android what could be the reason means why it is working smoothly.

Thanks