将结果从 DialogFragment 发送到 Fragment

Question

在对话框中我使用下一个扩展来发送结果

fun <T : Any> Fragment.setNavigationResult(
    result: T, key: String,
    navController: NavController = findNavController()
) {
    navController.previousBackStackEntry?.savedStateHandle?.set(key, result)
}

在片段中得到结果

fun <T>Fragment.getNavigationResult(@IdRes id: Int, key: String, onResult: (result: T) -> Unit) {
    val navBackStackEntry = findNavController().getBackStackEntry(id)

    val observer = LifecycleEventObserver { _, event ->
        if (event == Lifecycle.Event.ON_RESUME && navBackStackEntry.savedStateHandle.contains(key)) {
            val result = navBackStackEntry.savedStateHandle.get<T>(key)
            result?.let(onResult)
            navBackStackEntry.savedStateHandle.remove<T>(key)
        }
    }
    navBackStackEntry.lifecycle.addObserver(observer)

    viewLifecycleOwner.lifecycle.addObserver(LifecycleEventObserver { _, event ->
        if (event == Lifecycle.Event.ON_DESTROY) {
            navBackStackEntry.lifecycle.removeObserver(observer)
        }
    })
}

但我遇到这样的崩溃：

有人知道如何解决这个问题吗？