Bug 57731 - App crashes on startup after updating to Xamarin.Forms 2.3.5-pre5 (Android)
Summary: App crashes on startup after updating to Xamarin.Forms 2.3.5-pre5 (Android)
Status: RESOLVED FIXED
Alias: None
Product: Forms
Classification: Xamarin
Component: Android ()
Version: 2.3.5
Hardware: PC Windows
: High critical
Target Milestone: ---
Assignee: E.Z. Hart [MSFT]
URL:
: 57717 57730 ()
Depends on:
Blocks:
 
Reported: 2017-06-23 21:42 UTC by Chase Long
Modified: 2017-07-11 16:55 UTC (History)
5 users (show)

Tags: ac Android button
Is this bug a regression?: Yes
Last known good build: 2.3.4.247

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Status:
RESOLVED FIXED

Description Chase Long 2017-06-23 21:42:54 UTC
I am trying to update an application from Xamarin.Forms version 2.3.4 to 2.3.5-pre5. The app crashes on startup with the following as of 2.3.5-pre5:

06-23 14:30:05.984 I/MonoDroid(16172): UNHANDLED EXCEPTION:
06-23 14:30:06.138 I/MonoDroid(16172): System.NullReferenceException: Object reference not set to an instance of an object.
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.ButtonRenderer.UpdateBackgroundColor () [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\MasterDetailRenderer.cs:47 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\ImageRenderer.cs:80 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00019] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\VisualElementRenderer.cs:43 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0000d] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:25 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x0001f] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0003b] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\LabelRenderer.cs:60 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) <0x73c6260e88 + 0x0007b> in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\ImageRenderer.cs:80 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00019] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\VisualElementRenderer.cs:43 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0000d] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:25 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x0001f] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0003b] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\LabelRenderer.cs:60 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) <0x73c6260e88 + 0x0007b> in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\ImageRenderer.cs:80 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00019] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\VisualElementRenderer.cs:43 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0000d] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:25 
06-23 14:30:06.138 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.ListViewRenderer.UpdateHeader () [0x00011] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\TabbedRenderer.cs:37 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.ListViewRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1[TElement] e) [0x00016] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\SwitchRenderer.cs:81 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\ImageRenderer.cs:80 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00019] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\VisualElementRenderer.cs:43 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0000d] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:25 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x0001f] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0003b] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\LabelRenderer.cs:60 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) <0x73c6260e88 + 0x0007b> in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\ImageRenderer.cs:80 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00019] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\VisualElementRenderer.cs:43 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0000d] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:25 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x0001f] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0003b] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\LabelRenderer.cs:60 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) <0x73c6260e88 + 0x0007b> in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\ImageRenderer.cs:80 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00019] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\VisualElementRenderer.cs:43 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0000d] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:25 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x0001f] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0003b] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\LabelRenderer.cs:60 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) <0x73c6260e88 + 0x0007b> in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\ImageRenderer.cs:80 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00019] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\VisualElementRenderer.cs:43 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0000d] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:25 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x0001f] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x0003b] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\LabelRenderer.cs:60 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x0000d] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) <0x73c6260e88 + 0x0007b> in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\ImageRenderer.cs:80 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00019] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\VisualElementRenderer.cs:43 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0000d] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:25 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.NavigationRenderer.SwitchContentAsync (Xamarin.Forms.Page view, System.Boolean animated, System.Boolean removed) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:95 
06-23 14:30:06.139 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.NavigationRenderer.OnPushAsync (Xamarin.Forms.Page view, System.Boolean animated) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:53 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.NavigationRenderer.PushViewAsync (Xamarin.Forms.Page page, System.Boolean animated) [0x00002] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:113 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.NavigationRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1[TElement] e) [0x000ea] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:215 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\ImageRenderer.cs:80 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00019] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\FastRenderers\VisualElementRenderer.cs:43 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0000d] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:25 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.MasterDetailContainer.AddChildView (Xamarin.Forms.VisualElement childView) [0x00006] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.MasterDetailContainer.set_ChildView (Xamarin.Forms.VisualElement value) [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Platform.cs:190 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.MasterDetailRenderer.UpdateDetail () [0x0001c] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\WebViewRenderer.cs:113 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.MasterDetailRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00048] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\TableViewRenderer.cs:47 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0000d] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:25 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.AddChild (Xamarin.Forms.VisualElement view, System.Boolean layout) [0x00010] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:237 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.Platform.SetPage (Xamarin.Forms.Page newRoot) [0x0001b] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:154 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.FormsApplicationActivity.InternalSetPage (Xamarin.Forms.Page page) [0x000b7] in <b04fa84be1cb4529bae087399c91c815>:0 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.FormsApplicationActivity.SetMainPage () [0x00000] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Cells\TextCellRenderer.cs:12 
06-23 14:30:06.140 I/MonoDroid(16172):   at Xamarin.Forms.Platform.Android.FormsApplicationActivity.LoadApplication (Xamarin.Forms.Application application) [0x00020] in C:\BuildAgent\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Cells\EntryCellRenderer.cs:118 
06-23 14:30:06.140 I/MonoDroid(16172):   at MyNamespace.Client.Mobile.Android.MainActivity.Bootstrap () [0x00013] in C:\Users\Chase\projects\MyNamespace.Client.Mobile.Android\MainActivity.cs:164 
06-23 14:30:06.140 I/MonoDroid(16172):   at MyNamespace.Client.Mobile.Android.MainActivity.OnCreate (Android.OS.Bundle bundle) [0x000e0] in C:\Users\Chase\projects\MyNamespace.Client.Mobile.Android\MainActivity.cs:151 
06-23 14:30:06.140 I/MonoDroid(16172):   at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x00010] in /Users/builder/data/lanes/4695/9dbc4c53/source/xamarin-android/src/Mono.Android/obj/Release/android-23/mcw/Android.App.Activity.cs:2426 
06-23 14:30:06.140 I/MonoDroid(16172):   at (wrapper dynamic-method) System.Object:4256e2f3-1878-4039-bc03-f2b8ce943e62 (intptr,intptr,intptr)
06-23 14:30:06.258 W/art     (16172): JNI RegisterNativeMethods: attempt to register 0 native methods for android.runtime.JavaProxyThrowable
06-23 14:30:07.917 E/mono-rt (16172): [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object.

Windows 10, Visual Studio 2017, Xamarin 4.5.0.486, Xamarin.Android SDK 7.3.1.2. Tested on an Android tablet emulator (Intel Atom x86, API level 23, Android version 6.0) and on a physical Samsung Galaxy S7 (Android 7.0).
Comment 1 Jimmy [MSFT] 2017-06-23 21:59:45 UTC
*** Bug 57730 has been marked as a duplicate of this bug. ***
Comment 2 Jimmy [MSFT] 2017-06-23 22:11:47 UTC
*** Bug 57717 has been marked as a duplicate of this bug. ***
Comment 3 Jimmy [MSFT] 2017-06-23 22:17:40 UTC
https://github.com/xamarin/Xamarin.Forms/pull/1010
Comment 4 E.Z. Hart [MSFT] 2017-07-07 15:07:33 UTC
Fixed in 2.3.5-pre5
Comment 5 Chase Long 2017-07-07 15:13:13 UTC
E.Z. Hart, is that a typo? I reported this problem against 2.3.5-pre5, per this bug report:

"I am trying to update an application from Xamarin.Forms version 2.3.4 to 2.3.5-pre5. The app crashes on startup with the following as of 2.3.5-pre5:"
Comment 6 E.Z. Hart [MSFT] 2017-07-08 00:55:41 UTC
(In reply to Chase Long from comment #5)
> E.Z. Hart, is that a typo? I reported this problem against 2.3.5-pre5, per
> this bug report:
> 
> "I am trying to update an application from Xamarin.Forms version 2.3.4 to
> 2.3.5-pre5. The app crashes on startup with the following as of 2.3.5-pre5:"

I think there was an issue with the initial nuget package for 2.3.5-pre5 and we had to resubmit it. Have you tested it against the package that's up there now (2.3.5.255-pre5, added to nuget on 6/26)?
Comment 7 Frank Schwieterman 2017-07-11 16:55:25 UTC
> I think there was an issue with the initial nuget package for 2.3.5-pre5 and we
> had to resubmit it. Have you tested it against the package that's up there now
> (2.3.5.255-pre5, added to nuget on 6/26)?

We tried Xamarin.Forms.2.3.5.256-pre6 and it does look like this issue is fixed there.