Raygun4Maui throws ArgumentNullException in Release build (Android and iOS)

I'm using Raygun4Maui for both Android and iOS. It works fine in Debug mode but throws the following errors in Release build.

I wonder if Linker settings cause it or anything else?

iOS release setting: (Default settings for android)

<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net8.0-ios|AnyCPU'">
    <CreatePackage>false</CreatePackage>
    <EnableAssemblyILStripping>false</EnableAssemblyILStripping>
    <UseInterpreter>true</UseInterpreter>
    <NoSymbolStrip>true</NoSymbolStrip>
    <RuntimeIdentifier>ios-arm64</RuntimeIdentifier>
    <CodesignProvision>Automatic</CodesignProvision>
    <CodesignKey>iPhone Distribution</CodesignKey>
</PropertyGroup>


Debug.WriteLine($"Unable to signin: {ex.Message}");
await RaygunMauiClient.Current.SendInBackground(ex);


[DOTNET] Android Unhandled Exception: System.ArgumentNullException: ArgumentNull_Generic Arg_ParamName_Name, key
[DOTNET]    at System.Collections.Generic.Dictionary`2[[System.String, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Mindscape.Raygun4Net.Diagnostics.PEDebugInformation, Mindscape.Raygun4Net.NetCore.Common, Version=11.0.0.0, Culture=neutral, PublicKeyToken=d595e487e4f9f950]].TryInsert(String key, PEDebugInformation value, InsertionBehavior behavior)
[DOTNET]    at System.Collections.Generic.Dictionary`2[[System.String, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Mindscape.Raygun4Net.Diagnostics.PEDebugInformation, Mindscape.Raygun4Net.NetCore.Common, Version=11.0.0.0, Culture=neutral, PublicKeyToken=d595e487e4f9f950]].Add(String key, PEDebugInformation value)
[DOTNET]    at System.Linq.Enumerable.ToDictionary[PEDebugInformation,String](IEnumerable`1 source, Func`2 keySelector, IEqualityComparer`1 comparer)
[DOTNET]    at System.Linq.Enumerable.ToDictionary[PEDebugInformation,String](IEnumerable`1 source, Func`2 keySelector)
[DOTNET]    at Mindscape.Raygun4Net.RaygunErrorMessageBuilder.GetDebugInfoForStackFrames(IEnumerable`1 frames)
[DOTNET]    at Mindscape.Raygun4Net.RaygunErrorMessageBuilder.Build(Exception exception)
[DOTNET]    at Mindscape.Raygun4Net.RaygunMessageBuilder.SetExceptionDetails(Exception exception)
[DOTNET]    at Mindscape.Raygun4Net.RaygunClientBase.BuildMessage(Exception exception, IList`1 tags, IDictionary userCustomData, RaygunIdentifierMessage userInfo, Action`1 customiseMessage)
[DOTNET]    at Raygun4Maui.RaygunMauiClient.SendInBackground(Exception exception, IList`1 tags, IDictionary userCustomData, RaygunIdentifierMessage userInfo)

Thanks for the response.

1. Yes, it happened on both Android and iOS devices
2. It was from an Android phone (Galaxy S21 running Android 14). I also got the same error from iPhone 15 Pro (17.5.1) - Device/Crash log. All physical devices.
3. I tested both, with manually created simple new HttpException("Testing"), or with airplane mode on the "No internet connection" exception, and both crashed the app. It explains why we received crash info from both Apple store/Google play, but no errors on Raygun side.

4. Besides iOS release build settings in csproj from previous post, there is one more Trimmer option below.

   <ItemGroup>
   <TrimmerRootAssembly Include="System.Collections.Immutable" RootMode="library" />
   

Hi

I didn't enable DebugSymbols

After I realized Raygun caused the crash, I added additional code for handling unhandled exceptions across different platforms besides [options.RaygunSettings.CatchUnhandledExceptions = true;], now the app doesn't crash but Raygun doesn't work either. The error is now caught by UnhandledException log, or of course a try-catch around [RaygunMauiClient.Current.SendInBackground(ex);] prevents crashing too.

[DOTNET] LogRaygunException Exception: ArgumentNull_Generic Arg_ParamName_Name, key

Well, actually, the iOS unhandled exception (AppDomain.CurrentDomain.UnhandledException) couldn't prevent the app from crashing. unless we try-catch every SendInBackground(ex).

iOS Unhandled Exception: System.ArgumentNullException: ArgumentNullGeneric ArgParamName_Name, key at System.Linq.Enumerable.ToDictionary[PEDebugInformation,String](IEnumerable1 source, Func2 keySelector) at Mindscape.Raygun4Net.RaygunErrorMessageBuilder.GetDebugInfoForStackFrames(IEnumerable1 frames) at Mindscape.Raygun4Net.RaygunErrorMessageBuilder.Build(Exception exception) at Mindscape.Raygun4Net.RaygunMessageBuilder.SetExceptionDetails(Exception exception) at Mindscape.Raygun4Net.RaygunClientBase.BuildMessage(Exception exception, IList1 tags, IDictionary userCustomData, RaygunIdentifierMessage userInfo, Action1 customiseMessage) at Raygun4Maui.RaygunMauiClient.SendInBackground(Exception exception, IList1 tags, IDictionary userCustomData, RaygunIdentifierMessage userInfo) at App.ViewModel.LoginViewModel.SignInAsync() at ObjCRuntime.Runtime.ThrowException(IntPtr gchandle) at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName) at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass)

Update:

if I set the linker to None for iOS, it works fine in the release build, but we can't publish the app with None

<MtouchLink>None</MtouchLink>

I haven't tested android yet, but I assume it's the same trimmer issue, the lib is not trimmer-safe, the trimmer ends up removing too much

<RunAOTCompilation>False</RunAOTCompilation>
<PublishTrimmed>False</PublishTrimmed>

Hi MT,

looking into this now, my understanding is that this is an error in this method https://github.com/MindscapeHQ/raygun4net/blob/b6fdd23016e9bc28a1077343f2d30c68ccb7fc43/Mindscape.Raygun4Net.Core/Builders/RaygunErrorMessageBuilder.cs#L171-L190 when it tries to get the debug information from the Exception stack trace.

I still need to find why this code fails, but I believe some debug information is not available (e.g. stripped) in release builds and so that causes the crash.

I will keep you informed with what we find.

There is also the setting <MtouchNoSymbolStrip>true</MtouchNoSymbolStrip>. Have you tried this one as well and got similar results?

Hi, Thanks for looking into this.

I've also been testing the code for the last two days, with <MtouchNoSymbolStrip>true</MtouchNoSymbolStrip> as well.

For iOS: it crashes the app immediately in the release build regardless of the exception type, <MtouchLink>None</MtouchLink> fixes the issue. I opened the issue on MAUI side, they also believe it's a trimmer issue, and suggested me check with raygun to make it trimmer-safe. I was trying to add trimmed dll/assembly back via TrimmerRootAssembly or linker.xml, but was unsuccessful

For Android: Actually, it works fine in release mode with regular exceptions like API errors or simple new HttpRequestException("Testing"). However, it throws System.ArgumentNullException when the device is not connected to the internet (Airplane mode without wifi), It functions properly again once the internet connection is restored but keeps throwing unhandled exceptionTaskExceptionHolder_UnhandledException(ArgumentNull_Generic Arg_ParamName_Name, key)

Hope it helps.

Thanks

Hello, I managed to get the same exception that you had.

I need to investigate more, but I used the Sample project in https://github.com/MindscapeHQ/raygun4maui/tree/master/Raygun4Maui.SampleApp and compiled it for Release using dotnet publish -f net8.0-android -c Release.

The issue seems to start in Raygun4Maui.RaygunMauiClient+<SendInBackground> as your provided stack trace also shows.

I'll keep you posted with what I find.

Hi MT,

Letting you know that we have identified the cause of the issue and a package release with the fix is on the way.

Great, thanks for looking into this.

Hi

it works. No more errors/crashing in the release build.

Thanks, I've enabled portable PDBs