Intermittent 'Object reference not set to an instance of an object' in .NET 6 Background Service
I'm dealing with I'm relatively new to this, so bear with me. I'm sure I'm missing something obvious here, but I'm developing a background service using .NET 6 hosted worker services, but I'm working with an intermittent scenario where my service occasionally throws a `System.NullReferenceException` with the message 'Object reference not set to an instance of an object'. This happens when I try to access a property of a class that is supposed to be initialized in the `ExecuteAsync` method. Here’s a simplified version of my code: ```csharp public class MyBackgroundService : BackgroundService { private readonly IServiceProvider _serviceProvider; public MyBackgroundService(IServiceProvider serviceProvider) { _serviceProvider = serviceProvider; } protected override async Task ExecuteAsync(CancellationToken stoppingToken) { while (!stoppingToken.IsCancellationRequested) { using (var scope = _serviceProvider.CreateScope()) { var myDependency = scope.ServiceProvider.GetRequiredService<IMyDependency>(); var data = await myDependency.GetDataAsync(); // Potential NullReferenceException here ProcessData(data); } await Task.Delay(1000, stoppingToken); } } private void ProcessData(MyData data) { // Accessing a property on data that could be null Console.WriteLine(data.SomeProperty); } } ``` I’ve confirmed that `GetDataAsync()` is supposed to return a valid `MyData` object, but in some runs, it seems to return null, leading to the exception when I access `SomeProperty`. I've added logging to check the return value of `GetDataAsync()`, and it appears that there are cases where the data retrieval fails silently. I've tried checking for null before processing the data: ```csharp if (data != null) { ProcessData(data); } else { Console.WriteLine("Received null data."); } ``` However, it's frustrating that this scenario is intermittent and I need to replicate it consistently. I've also verified that my dependency injection configuration is correct and that `IMyDependency` is scoped properly. Does anyone have insights on what might be causing the `null` returns, or how I can better handle this situation to avoid the exception? Has anyone else encountered this? I recently upgraded to Csharp 3.11. Any examples would be super helpful. I've been using Csharp for about a year now. Any suggestions would be helpful. How would you solve this?