Bug 25405 - (Very) Intermittent Crash Navigating 'Back' in Windows Phone
Summary: (Very) Intermittent Crash Navigating 'Back' in Windows Phone
Status: RESOLVED DUPLICATE of bug 25573
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.3.0
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2014-12-15 17:12 UTC by troywillmot
Modified: 2015-01-12 09:29 UTC (History)
4 users (show)

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

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Status:
RESOLVED DUPLICATE of bug 25573

Description troywillmot 2014-12-15 17:12:11 UTC
Very occasionally when I navigate 'back' from a page on Windows Phone I get an error with the below details. I think I have only seen this on real devices and not the simulator, but not sure. Defintely happens sometimes on a Lumia 820.
As far as I can tell from the stack trace, this seems to be a bug in Xamarin's forms library and not my code.

System.InvalidOperationExceptionElement is already the child of another element.

at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.Collection_AddValue[T](PresentationFrameworkCollection`1 collection, CValue value)
   at MS.Internal.XcpImports.Collection_AddDependencyObject[T](PresentationFrameworkCollection`1 collection, DependencyObject value)
   at System.Windows.PresentationFrameworkCollection`1.AddDependencyObject(DependencyObject value)
   at System.Windows.Controls.UIElementCollection.AddInternal(UIElement value)
   at System.Windows.PresentationFrameworkCollection`1.Add(T value)
   at Xamarin.Forms.Platform.WinPhone.Platform.<>c__DisplayClass46.<SetCurrent>b__3e(Object s, EventArgs e)
   at Microsoft.Phone.Controls.Transition.OnCompleted(Object sender, EventArgs e)
   at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)
Comment 1 Ram Chandra 2015-01-06 03:41:46 UTC
I have checked this issue but I am unable to reproduce this behavior, we may have to see if a developer can figure out what's going on from the stack trace. If you have a chance, it might also be helpful to include sample project, build info and logs (debug logs + IDE). 

You can get build info from here:
Visual Studio => Help => About Microsoft Visual Studio => Copy Info

You can get IDE logs from here:
Visual Studio => Help => Zip Xamarin Logs
Comment 2 troywillmot 2015-01-06 16:42:45 UTC
Thank you for taking the time to investigate, I appreciate that as it is an intermittent bug it is difficult to track down.

I haven't submitted a sample because it is intermittent and I cannot reliably reproduce it, so submitting a questionable sample seemed to do more harm than good. I was hoping an engineer could investigate based on the stack trace and figure it out.

Here is my VS build data in case it helps;

Microsoft Visual Studio Ultimate 2013
Version 12.0.31101.00 Update 4
Microsoft .NET Framework
Version 4.5.51641

Installed Version: Ultimate

Architecture and Modeling Tools   06181-004-0449004-02623
Microsoft Architecture and Modeling Tools
    
UML® and Unified Modeling Language™ are trademarks or registered trademarks of the Object Management Group, Inc. in the United States and other countries.

Team Explorer for Visual Studio 2013   06181-004-0449004-02623
Microsoft Team Explorer for Visual Studio 2013

Visual Basic 2013   06181-004-0449004-02623
Microsoft Visual Basic 2013

Visual C# 2013   06181-004-0449004-02623
Microsoft Visual C# 2013

Visual C++ 2013   06181-004-0449004-02623
Microsoft Visual C++ 2013

Visual F# 2013   06181-004-0449004-02623
Microsoft Visual F# 2013

Visual Studio 2013 Code Analysis Spell Checker   06181-004-0449004-02623
Microsoft® Visual Studio® 2013 Code Analysis Spell Checker

Portions of International CorrectSpell™ spelling correction system © 1993 by Lernout & Hauspie Speech Products N.V. All rights reserved.

The American Heritage® Dictionary of the English Language, Third Edition Copyright © 1992 Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

Windows Phone SDK 8.0 - ENU   06181-004-0449004-02623
Windows Phone SDK 8.0 - ENU

.NET Memory Profiler   4.6
.NET Memory Profiler Visual Studio Integration Package

ASP.NET and Web Tools   12.4.51016.0
Microsoft Web Developer Tools contains the following components:
Support for creating and opening ASP.NET web projects
Browser Link: A communication channel between Visual Studio and browsers
Editor extensions for HTML, CSS, and JavaScript
Page Inspector: Inspection tool for ASP.NET web projects
Scaffolding: A framework for building and running code generators
Server Explorer extensions for Microsoft Azure Websites
Web publishing: Extensions for publishing ASP.NET web projects to hosting providers, on-premises servers, or Microsoft Azure

ASP.NET Web Frameworks and Tools 2012.2   4.1.21001.0
For additional information, visit http://go.microsoft.com/fwlink/?LinkID=309563

ASP.NET Web Frameworks and Tools 2013   5.2.21010.0
For additional information, visit http://www.asp.net/

Common Azure Tools   1.3
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Microsoft Advertising SDK for Windows Phone   
Microsoft Advertising SDK for Windows Phone
Build 

Microsoft Azure HDInsight HQL Service   1.0.0000.0
Language service for Hive query

Microsoft Azure HDInsight Tools for Visual Studio   1.0.0000.0
An integrated development environment for HDInsight application development.

Microsoft Azure Mobile Services Tools   1.3
Microsoft Azure Mobile Services Tools

Microsoft Azure Tools   2.4
Microsoft Azure Tools for Microsoft Visual Studio 2013 - v2.4.20730.1601

Microsoft Azure Tools   2.5
Microsoft Azure Tools for Microsoft Visual Studio 2013 - v2.5.21104.1601

Microsoft Team Foundation Server 2013 Power Tools   12.0
Power Tools that extend the Team Foundation Server integration with Visual Studio.

Microsoft Visual Studio Process Editor   1.0
Process Editor for Microsoft Visual Studio Team Foundation Server

NuGet Package Manager   2.8.50926.663
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

PowerShell Tools   1.3
Provides file classification services using PowerShell

PreEmptive Analytics Visualizer   1.2
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.

Release Management for Visual Studio Package   1.0
Release Management for Visual Studio

SQL Server Data Tools   12.0.41025.0
Microsoft SQL Server Data Tools

Windows Azure Tools   2.3
Windows Azure Tools for Microsoft Visual Studio 2013 - v2.3.20320.1602

Windows Phone 8.1 SDK Integration   1.0
This package integrates the tools for the Windows Phone 8.1 SDK into the menus and controls of Visual Studio.

Xamarin   3.8.150.0 (10cfd178d55287f09c85f5a1e604dfe20889a40f)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin.Android   4.20.0.28 (ba9bbbdd44cfdc4bf485e8885bd2ad24fba525f7)
Visual Studio plugin to enable development for Xamarin.Android.

Xamarin.iOS   8.4.0.0 (840a925103a0bf4a856507f13d5eaee3c1579c2f)
Visual Studio extension to enable development for Xamarin.iOS.
Comment 3 troywillmot 2015-01-06 16:43:19 UTC
Provided as much useful info as I can at this point.
Comment 4 Ram Chandra 2015-01-12 09:29:21 UTC

*** This bug has been marked as a duplicate of bug 25573 ***