I have a MainActivity on which fragments are switched using BottomNavigationView. There is a spinner on the main fragment, which contains 2 items.

the problem is that an error occurs when returning again: Parameter specified as non-null is null: method com.example.helper1.HomeFragment$createSpinner$1.onItemSelected, parameter view

class HomeFragment :  Fragment(){
    private lateinit var binding: FragmentHomeBinding
    var data: Array<String> = arrayOf("Мероприятие", "Задачу")

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        binding = FragmentHomeBinding.inflate(inflater)
        createSpinner()
        return binding.root
    }

    private  fun createSpinner(){
        val adapter: ArrayAdapter<String> =
            ArrayAdapter<String>(
                (activity as MainActivity).getContext(),
                R.layout.simple_spinner_item,
                data)
        adapter.setDropDownViewResource(R.layout.simple_spinner_dropdown_item)
        val spinner = binding.spinner
        spinner.adapter = adapter
        spinner.setSelection(1)
        spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
            override fun onItemSelected(
                parent: AdapterView<*>,
                view: View,
                position: Int,
                id: Long
            ) {
                if(position== 0){
                    binding.InputBar.visibility = View.VISIBLE
                } else{
                    binding.InputBar.visibility = View.GONE
                }
            }

            override fun onNothingSelected(arg0: AdapterView<*>) {}
        }

    }
    companion object {
        @JvmStatic
        fun newInstance() = HomeFragment()
    }

}

but I can’t figure out why view is null in any way.