Почему вылетает приложение при быстром переключении табов в BottomNavigationView?

Код активности

public class NavigationActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_navigation);




    getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
    getSupportActionBar().setCustomView(R.layout.tool_bar);
    tw = findViewById(R.id.mytext);



    BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
    navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);

    Intent intent = getIntent();


    if (intent.getStringExtra("screen") == null){

        tw.setText("Новости САМ");

        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_contayner,new NewsFragment()).commit();

    }else {

        tw.setText("Мойка САМ");
        navigation.setSelectedItemId(R.id.myBy);

        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_contayner,new MyByFragment()).commit();

    }


}





private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
        = new BottomNavigationView.OnNavigationItemSelectedListener() {



    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {

        Fragment selectedFragment = null;
        switch (item.getItemId()) {
            case R.id.navigation_sam:
                tw.setText("Новости CАМ");
                selectedFragment = new NewsFragment();
                break;
            case R.id.question:
                tw.setText("Обратная связь");

                selectedFragment = new QuestionGroup();

                break;
            case R.id.myBy:
                tw.setText("Мои покупки");


                selectedFragment = new MyByFragment();

                break;
            case R.id.maps:
                tw.setText("Карта");

                if (ActivityCompat.checkSelfPermission(NavigationActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                        && ActivityCompat.checkSelfPermission(NavigationActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

                    ActivityCompat.requestPermissions(NavigationActivity.this,
                            new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                            1);
                }
                selectedFragment = new MapsFragment();

                break;
            case R.id.instruction:
                tw.setText("Как пользоваться");
                selectedFragment = new InstructionFragment();

                break;
        }
        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_contayner,selectedFragment).commit();



        return true;
    }
};




TextView tw;





public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.exit_menu, menu);



    return true;
}


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {

            case R.id.item1:


                MyDialogFragment myDialogFragment = new MyDialogFragment();
                FragmentManager manager = getSupportFragmentManager();
                myDialogFragment.show(manager, "dialog");

                break;

            default:
                break;
        }

        return true;
    }


@Override
public void onBackPressed() {
}

}