Bug 39453 - Android thorow ArgumentException: 'jobject' must not be IntPtr.Zero.
Summary: Android thorow ArgumentException: 'jobject' must not be IntPtr.Zero.
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 2.1.0
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2016-03-08 17:02 UTC by Kirill
Modified: 2017-06-19 16:21 UTC (History)
8 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Kirill 2016-03-08 17:02:13 UTC
Xamarin Forms
Xamarin for Visual Studio
Visual Studio 2015

Android 4.1.1 or 4.1.2 (< 17 api)

Error throw when set MainPage if before MainPage already been installed NavigationPage

Application.Current.MainPage = new NavigationPage(new MyPage);

P.S. MyPage is completely empty. Inside, no, XAML elements. Furthermore, no MyPage C # code. MyPage is a blank page. Within MyPage no ScrollView.

Error Stack:

System.ArgumentException'jobject' must not be IntPtr.Zero. Parameter name: jobject
Android.Runtime.JNIEnv.CallNonvirtualBooleanMethod(IntPtr jobject, IntPtr jclass, IntPtr jmethod)JNIEnv.g.cs:632
System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>m__0(object state)AsyncMethodBuilder.cs:994
Java.Lang.IRunnableInvoker.n_Run(IntPtr jnienv, IntPtr native__this)Java.Lang.IRunnable.cs:71
at (wrapper dynamic-method) System.Object:ee973a8d-395c-4dc2-bcbe-e2da01c22a80 (intptr,intptr)
Comment 1 Samantha Houts [MSFT] 2016-03-10 20:49:32 UTC
Thank you for taking the time to submit the bug. We tried to reproduce the issue you reported but were unable given the description. If you could please attach a reproduction to the bug by starting with a clean Xamarin.Forms project and adding just the code necessary to demonstrate the issue we would very much appreciate it.

Warm regards,
Xamarin Forms Team
Comment 2 Hines Vaughan III 2016-06-01 16:00:25 UTC
I received the exact same exception on Android and it turned out that I was not awaiting the animated `ScrollToAsync()` call. The exception would happen when a call to ScrollToAsync was made on item 1 and then, while scrolling to item 1 was still going on, another call to ScrollToAsync was made on item 2.
Comment 3 Chris Hardy [MSFT] 2017-06-19 16:21:59 UTC
Because we have not received a reply to our request for more information we are closing this issue. If you are still encountering this issue, please reopen the ticket with the requested information. Thanks!