FragmentWithBundle2.kt

class MainActivity : AppCompatActivity() {
	
  val mainFragment by fragmentByTagOrNew(MainFragment.TAG) {
    MainFragment().withArgs {
      putString(MainFragment.KEY_TEXT, "Now this won't crash")
    }
  }
	
  override fun onCreate(savedInstanceState: Bundle?) {
   
    if(!mainFragment.isAdded()) {
      supportFragmentManager.beginTransaction()
        .add(R.layout.fragmentContainerView, mainFragment)
        .commit()	
      }
    }
}

class MainFragment : Fragment() {
   private val textToDisplay by argument<String>(KEY_TEXT)
  
   override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
     textToDisplay = requireArguments().getString(KEY_TEXT)
     // Logic related to using $textToDisplay
   }
  companion object {
    const val KEY_TEXT = "KeyText"
    const val TAG = "MainFragment"
  }
}