NullReferenceException thrown on Android 14 / IL2CPP

[Nomad1108]

I've got this ShowHint() method in my HintVisualizer.cs where I tried to implement UniTask:

1. Replacing Tween.Delay with UniTask.Delay

public async void ShowHint() { [...] await Tween.Delay(1.75f); [...] }

Becomes:

public async void ShowHint() { [...] await UniTask.Delay(TimeSpan.FromSeconds(1.75f)); [...] }

Produces the following error in Android Logcat when buiding on my Pixel 7 (targeting API level 34 = Android 14):

2024/08/23 12:20:26.137 27269 27297 Error Unity NullReferenceException: Object reference not set to an instance of an object.
2024/08/23 12:20:26.137 27269 27297 Error Unity   at Cysharp.Threading.Tasks.PlayerLoopHelper.AddAction (Cysharp.Threading.Tasks.PlayerLoopTiming timing, Cysharp.Threading.Tasks.IPlayerLoopItem action) [0x00000] in <00000000000000000000000000000000>:0 
2024/08/23 12:20:26.137 27269 27297 Error Unity   at Cysharp.Threading.Tasks.UniTask+DelayPromise.Create (System.TimeSpan delayTimeSpan, Cysharp.Threading.Tasks.PlayerLoopTiming timing, System.Threading.CancellationToken cancellationToken, System.Boolean cancelImmediately, System.Int16& token) [0x000b5] in ./Library/PackageCache/com.cysharp.unitask@cdf88c6a6a/Runtime/UniTask.Delay.cs:735 
2024/08/23 12:20:26.137 27269 27297 Error Unity   at Cysharp.Threading.Tasks.UniTask.Delay (System.TimeSpan delayTimeSpan, Cysharp.Threading.Tasks.DelayType delayType, Cysharp.Threading.Tasks.PlayerLoopTiming delayTiming, System.Threading.CancellationToken cancellationToken, System.Boolean cancelImmediately) [0x0007d] in ./Library/PackageCache/com.cysharp.unitask@cdf88c6a6a/Runtime/UniTask.Delay.cs:193 
2024/08/23 12:20:26.137 27269 27297 Error Unity   at Cysharp.Threading.Tasks.UniTask.

2. Replacing async void with async UniTaskVoid

public async void ShowHint() { [...] await Tween.Delay(1.75f); [...] }

Becomes:

public async UniTaskVoid ShowHint() { [...] await Tween.Delay(1.75f); [...] }

Produces the following error in Android Logcat when buiding on my Pixel 7 (targeting API level 34 = Android 14):

2024/08/23 12:38:55.064 28899 28921 Error Unity System.NullReferenceException: Object reference not set to an instance of an object.
2024/08/23 12:38:55.064 28899 28921 Error Unity   at Cysharp.Threading.Tasks.PlayerLoopHelper.AddContinuation (Cysharp.Threading.Tasks.PlayerLoopTiming timing, System.Action continuation) [0x00000] in <00000000000000000000000000000000>:0 
2024/08/23 12:38:55.064 28899 28921 Error Unity   at Cysharp.Threading.Tasks.CompilerServices.AsyncUniTaskVoidMethodBuilder.SetResult () [0x0001c] in ./Library/PackageCache/com.cysharp.unitask@cdf88c6a6a/Runtime/CompilerServices/AsyncUniTaskVoidMethodBuilder.cs:66 
2024/08/23 12:38:55.064 28899 28921 Error Unity   at HintVisualizer.ShowHint () [0x008e2] in /Users/Nomad1108/Unity Files/Projects/Solitaire/Assets/3-Scripts/CoreMechanics/HintVisualizer.cs:241 
2024/08/23 12:38:55.064 28899 28921 Error Unity   at Cysharp.Threading.Tasks.CompilerServices.AsyncUniTaskVoid`1[TStateMachine].Run () [0x0000d] in ./Library/PackageCache/com.cysharp.unitask@cdf88c6a6a/Runtime/CompilerServices/StateMachineRunner.cs:104 

Context

• ShowHint() is only called during the game, that is to say once the scene has fully loaded.
• HintVisualizer.cs is a component of a game object in this scene, it is never destroyed nor deactivated.
• I only get these errors when testing on my phone with Android Logcat, no errors are thrown when testing on my Mac in the Unity Editor, which is even more frustrating...

Version Unity 2022.3.38f1 - UniTask 2.5.5

Player Settings

Build Settings

[neuecc]

I don't know why, but it seems that the initialization process is not working properly and the insertion of UniTaskRunner into PlayerLoop is not working in some cases. If you explicitly initialize it when starting up, it should work.

[Nomad1108]

Thanks for the tip, strangely I can no longer reproduce these issues today, whereas the only change I made was to add Debug.Log("UniTaskPlayerLoop ready? " + PlayerLoopHelper.IsInjectedUniTaskPlayerLoop()); in Awake.

Since it was returning "True" both in editor and in the dev build I finally removed this line and my methods kept working fine! I presume Unity didn't import UniTask properly in my previous builds...