Unexpected NullPointerException when accessing LiveData in Fragment using Kotlin coroutines on Android 14
I've encountered a strange issue with I'm experimenting with I'm a bit lost with I'm trying to figure out I'm working on a project and hit a roadblock. I'm working with a `NullPointerException` when trying to observe a `LiveData` object in my Fragment that uses Kotlin coroutines. The behavior occurs intermittently, mainly when the Fragment is being recreated after a configuration change. Here's the relevant code snippet: ```kotlin class MyViewModel : ViewModel() { private val _data = MutableLiveData<String>() val data: LiveData<String> get() = _data fun updateData(newData: String) { _data.value = newData } } ``` In my Fragment, I am using the following code to observe the LiveData: ```kotlin class MyFragment : Fragment() { private lateinit var viewModel: MyViewModel override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { viewModel = ViewModelProvider(this).get(MyViewModel::class.java) return inflater.inflate(R.layout.fragment_my, container, false) } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { lifecycleScope.launch { viewModel.data.observe(viewLifecycleOwner) { data -> val processedData = data.length // This line throws NullPointerException // update UI with processedData } } } } ``` The scenario seems to stem from the fact that `data` could be null when it's accessed in the observer. I've verified that I'm initializing the `LiveData` in the ViewModel, but for some reason, it appears to be null after the Fragment is recreated. I've also tried using `viewModel.data?.observe(...)` to safely unwrap the value, but that doesn't resolve the underlying scenario. I've confirmed that `updateData()` is called before observing, yet I still receive the `NullPointerException`. I am using Android 14 with coroutines and the latest version of the lifecycle components. Any insights on what might be causing this scenario or how to prevent the NullPointerException would be greatly appreciated! I'd really appreciate any guidance on this. This is my first time working with Kotlin 3.11. What am I doing wrong? Hoping someone can shed some light on this. What are your experiences with this? For context: I'm using Kotlin on Windows 10. I'm open to any suggestions.