Closed BlyZeYT closed 2 years ago
Yeah don't ask about that Minecraft skin bottom right
I am experiencing this as well. Page would load fine and then all of a sudden anytime I go to it I get a Null Ref Exception.
This also started happening on another page in my app.
This is from Debug Log...
[AppCenter] HTTP response status=200 payload={"status":"Success","validDiagnosticsIds":[],"throttledDiagnosticsIds":[],"correlationId":"81ec9d5d-865d-4281-a24f-2e8c42fa308d"} [AppCenterCrashes] Unhandled Exception from source=AppDomain [AppCenterCrashes] System.NullReferenceException: Object reference not set to an instance of an object. [AppCenterCrashes] at Android.Runtime.JNINativeWrapper._unhandled_exception (System.Exception e) [0x0000e] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:12 [AppCenterCrashes] at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLLL_L (_JniMarshal_PPLLL_L callback, System.IntPtr jnienv, System.IntPtr klazz, System.IntPtr p0, System.IntPtr p1, System.IntPtr p2) [0x00022] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:298 [AppCenterCrashes] at (wrapper native-to-managed) Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLLL_L(intptr,intptr,intptr,intptr,intptr) [AppCenterCrashes] Saving uncaught exception. [AppCenterCrashes] Saved JSON content for ingestion into /data/user/0/com.barwatch.app.v1/files/error/77af0b82-6449-4109-8c41-9063463072f3.json [AppCenterCrashes] Saved raw wrapper exception data into /data/user/0/com.barwatch.app.v1/files/error/77af0b82-6449-4109-8c41-9063463072f3.dat [mono-rt] [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object. [mono-rt] at Android.Runtime.JNINativeWrapper._unhandled_exception (System.Exception e) [0x0000e] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:12 [mono-rt] at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLLL_L (_JniMarshal_PPLLL_L callback, System.IntPtr jnienv, System.IntPtr klazz, System.IntPtr p0, System.IntPtr p1, System.IntPtr p2) [0x00022] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:298 [mono-rt] at (wrapper native-to-managed) Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLLL_L(intptr,intptr,intptr,intptr,intptr)
I experience this also, it appears to be related to pushing pages onto the navigation stack too quickly on startup;
System.NullReferenceException: Object reference not set to an instance of an object. at Android.Runtime.JNINativeWrapper._unhandled_exception (System.Exception e) [0x0000e] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:12 at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PP_V (_JniMarshal_PP_V callback, System.IntPtr jnienv, System.IntPtr klazz) [0x0001c] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:23 at (wrapper native-to-managed) Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PP_V(intptr,intptr)
I experience this also, it appears to be related to pushing pages onto the navigation stack too quickly on startup;
System.NullReferenceException: Object reference not set to an instance of an object. at Android.Runtime.JNINativeWrapper._unhandled_exception (System.Exception e) [0x0000e] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:12 at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PP_V (_JniMarshal_PP_V callback, System.IntPtr jnienv, System.IntPtr klazz) [0x0001c] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:23 at (wrapper native-to-managed) Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PP_V(intptr,intptr)
This even Happens when I replace the Navigation Page in Flyout.Detail with a Content page
What versions of Xamarin.Forms are you using? Did it happen with a previous version as well?
What versions of Xamarin.Forms are you using? Did it happen with a previous version as well?
I'm using Xamarin.Forms 5.0.0.2478. It worked on this version and all of a sudden it doesn't anymore
I can try downgrading.
On Xamarin.Forms 5.0.0.2401 the same happens with the same exception
I have the same problem. I use the Xamarin.Forms 5.0.0.2401
I have the same issue, but I am not even using Forms. I use Xamarin.Android.
I fixed the issue.
I put a try catch on that InitializeComponent(); and there I got the error by hovering over the catched exception in debug.
public Generator()
{
try
{
InitializeComponent();
}
catch (Exception ex)
{
throw ex;
}
flyout.qrcodeMenuList.ItemSelected += OnSelectedItem;
}
And guess what the error was...
The FlyoutPage was the problem not the Generator Page where the exception was thrown.
I didn't had a title set on the FlyoutPage and because of that it crashed.
So if you have an error and get a meaningless exception, try to set the line where the exception happens in a try catch block and maybe you get more information.
I hope it helps someone who also has such a or similar error.
Keep going guys :)
Description
That's the exception: {System.NullReferenceException: Object reference not set to an instance of an object. at Android.Runtime.JNINativeWrapper._unhandled_exception (System.Exception e) [0x0000e] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:12 at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPL_V (_JniMarshal_PPL_V callback, System.IntPtr jnienv, System.IntPtr klazz, System.IntPtr p0) [0x0001d] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:111 at (wrapper native-to-managed) Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPL_V(intptr,intptr,intptr)}
That's the stack trace of the exception: " at Android.Runtime.JNINativeWrapper._unhandled_exception (System.Exception e) [0x0000e] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:12 \n at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPL_V (_JniMarshal_PPL_V callback, System.IntPtr jnienv, System.IntPtr klazz, System.IntPtr p0) [0x0001d] in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:111 \n at (wrapper native-to-managed) Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPL_V(intptr,intptr,intptr)"
Exception source: "Mono.Android"
Thats my xaml file:
Thats my .cs file:
See screenshot.
Steps to Reproduce
Expected Behavior
The App should start normally
Actual Behavior
The app crashes everytime with a NullReferenceException
Basic Information
Environment
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Screenshots