# IFatalErrorHandler.OnFatalException(object, string, Exception)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.ifatalerrorhandler/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.ifatalerrorhandler/methods/)

```csharp
public abstract void OnFatalException(object sender = null, string context = null, Exception exception = null)
```

Called when a fatal exception occurs.

### Parameters

- `sender` (`object`): The sender.
- `context` (`string`): The context.
- `exception` (`Exception`): The exception.