Is it possible to receive a null object coming from another fragment in Android?

The problem is this: I have two fragments, the first one has a list, which if clicked, sends an object to be edited in fragment B. In fragment A there is also an include button that when clicked opens fragment B to record certain information. The code for fragment A is this:

public class AlarmFragment extends Fragment {
private OnFragmentInteractionListener mListener;
private ListView lista;
FloatingActionButton btnAddAlarme;

public AlarmFragment() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    final View view = inflater.inflate(R.layout.fragment_alarm, container, false);



    TimerDAO dao = new TimerDAO(getActivity());

    List<Timer> timers = dao.getListaAgendamentos();
    dao.close();

    int layout = android.R.layout.simple_list_item_1;
    ListaAgendamentosCadastradosAdapter adapter = new ListaAgendamentosCadastradosAdapter(timers, layout, getActivity());
    //ArrayAdapter<Timer> adapter = new ArrayAdapter<Timer>(getActivity(), layout, timers);

    lista = (ListView)view.findViewById(R.id.listaAgendamentosCadastrados);

    lista.setAdapter(adapter);

    lista.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Timer agendamentoClicado = (Timer)parent.getItemAtPosition(position);
            CadastroAlarmFragment cadastroAlarmFragment = new CadastroAlarmFragment();

            Bundle args = new Bundle();
            args.putSerializable("agendamentoSelecionado", agendamentoClicado);
            cadastroAlarmFragment.setArguments(args);

            FragmentManager manager = getFragmentManager();
            manager.beginTransaction().replace(R.id.content_main, cadastroAlarmFragment, cadastroAlarmFragment.getTag()).commit();
        }
    });

    btnAddAlarme = (FloatingActionButton) view.findViewById(R.id.btnAddAlarme);

    btnAddAlarme.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            CadastroAlarmFragment cadastroAlarmFragment = new CadastroAlarmFragment();
            FragmentManager manager = getFragmentManager();
            manager.beginTransaction().replace(
                    R.id.content_main,
                    cadastroAlarmFragment,
                    cadastroAlarmFragment.getTag()
            ).commit();

        }
    });

    return view;
}

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

}

@Override
public void onAttach(Context context) {
    super.onAttach(context);
}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}

public interface OnFragmentInteractionListener {
    void onFragmentInteraction(Uri uri);
}

}

Following the searches on the Internet, I send the existing object from fragment A to fragment B through a Serializable. When the second fragment is opened, I perform a check to see if what came through the serializable is an object to be edited or if I need to register a new one. The code for fragment B is as follows:

    public class CadastroAlarmFragment extends Fragment {

    TextView txt_idAgendamento;
    AlarmManager alarmManager;
    TextClock tcHoraAtual;
    Spinner cbSelecaoValvulaCadastroAgendamento;
    EditText etTempoDeFuncionamentoCadastroAgendamento;
    Button btnSalvaAgendamento;
    ToggleButton btnAtivaAgendamento;
    Long milli;
    String actualTime;
    Boolean clickTime = false;
    Context context;
    PendingIntent pendingIntent;
    int hour, minute;
    String horaMinuto;
    public CadastroAlarmHelper helper;


    public CadastroAlarmFragment() {
        // Required empty public constructor
    }

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

    }

    @RequiresApi(api = Build.VERSION_CODES.N)
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_cadastro_alarm2, container, false);

        helper = new CadastroAlarmHelper(view);

        tcHoraAtual = (TextClock)view.findViewById(R.id.tcHoraAtual);
        cbSelecaoValvulaCadastroAgendamento = (Spinner)view.findViewById(R.id.cbSelecaoValvulaCadastroAgendamento);
        etTempoDeFuncionamentoCadastroAgendamento = (EditText)view.findViewById(R.id.etTempoDeFuncionamentoCadastroAgendamento);
        btnSalvaAgendamento = (Button)view.findViewById(R.id.btnSalvaAgendamento);
        btnAtivaAgendamento = (ToggleButton)view.findViewById(R.id.btnAtivaAgendamento);
        txt_idAgendamento = (TextView)view.findViewById(R.id.txt_idAgendamento);

        Bundle bundle = getArguments();

        final Timer agendamentoParaSerAlterado = (Timer)bundle.getSerializable("agendamentoSelecionado");
        if(agendamentoParaSerAlterado!= null)
        {
           btnSalvaAgendamento.setText("Salvar Alterações");
           helper.colocaAgendamentoNaTela(agendamentoParaSerAlterado);
           tcHoraAtual.setText(agendamentoParaSerAlterado.getDataHoraInicio());
        }
        else if(agendamentoParaSerAlterado == null){
            tcHoraAtual.setFormat24Hour(getTime());
        }

        this.context = getActivity();
        alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);


        TimePickerFragment timePickerFragment = new TimePickerFragment();
        //Cria a instancia do calendario
        final java.util.Calendar calendar =  timePickerFragment.calendar;

        //Criando Intent pra classe AlarmReceiver
        final Intent intent =  new Intent(this.context, AlarmReceiver.class);


        loadSpinnerData();

        tcHoraAtual.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                clickTime = true;
                DialogFragment newFragment = new TimePickerFragment();
                newFragment.show(getActivity().getFragmentManager(), "TIMEPICKER");
            }
        });


        btnSalvaAgendamento.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String tempo = etTempoDeFuncionamentoCadastroAgendamento.getText().toString();
                if(tempo.isEmpty()){
                    Toast.makeText(getActivity(), "Digite o tempo de funcionamento!", Toast.LENGTH_SHORT).show();
                }
                else{

                    Timer timer = helper.pegaInfoIrrigacaoCadastro();
                    TimerDAO dao = new TimerDAO(getActivity());

                    if(horaMinuto!=null) {
                        horaMinuto = tcHoraAtual.getText().toString();
                        hour = Integer.parseInt(horaMinuto.substring(0, 2));
                        minute = Integer.parseInt(horaMinuto.substring(3, 5));
                    }

                    else if(agendamentoParaSerAlterado == null)
                    {
                        calendar.set(java.util.Calendar.HOUR_OF_DAY, hour);
                        calendar.set(java.util.Calendar.MINUTE, minute);

                        final int _id = ((int)System.currentTimeMillis())*-1;
                        txt_idAgendamento.setText(String.valueOf(_id));

                        intent.putExtra("extra", "on"+tempo);
                        pendingIntent = PendingIntent.getBroadcast(getActivity(), _id, intent, PendingIntent.FLAG_UPDATE_CURRENT);

                        //Definir o AlarmManager
                        alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);

                        dao.salvaTimer(timer);
                    }
                    else{

                        agendamentoParaSerAlterado.setId(agendamentoParaSerAlterado.getId());
                        dao.alteraTimer(timer);
                        Toast.makeText(getActivity(), "Alterações Salvas!", Toast.LENGTH_SHORT);

                    }
                    dao.close();

                    AlarmFragment alarmFragment = new AlarmFragment();
                    FragmentManager manager = getFragmentManager();
                    manager.beginTransaction().replace(
                            R.id.content_main,
                            alarmFragment,
                            alarmFragment.getTag()
                    ).commit();
                }
            }
        });

        btnAtivaAgendamento.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){

                }
                else {
                    String idAgendamento = (String) txt_idAgendamento.getText();
                    int _idAgendamento = Integer.valueOf(idAgendamento);
                    alarmManager.cancel(PendingIntent.getBroadcast(getActivity(), _idAgendamento, intent, PendingIntent.FLAG_CANCEL_CURRENT));
                    //put extra string into intent
                    //Tells the clock that youpressed "cancelar alarme"
                    intent.putExtra("extra","off");
                    //Para a musica
                    context.sendBroadcast(intent);
                }
            }
        });


        return view;
    }


    @RequiresApi(api = Build.VERSION_CODES.N)
    public String getTime()
    {
        milli = System.currentTimeMillis();
        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
        Date result = new Date(milli);
        actualTime = sdf.format(result);
        return actualTime;
    }

    private void loadSpinnerData()
    {
        TimerDAO dao = new TimerDAO(getActivity());
        Cursor servicesCursor = dao.getServicesCursor();

        String[]from = {"nomeValvula"};
        int[] to ={android.R.id.text1};

        SimpleCursorAdapter dataAdapter = new SimpleCursorAdapter(getActivity(), android.R.layout.simple_spinner_dropdown_item, servicesCursor, from, to, 0);

        cbSelecaoValvulaCadastroAgendamento.setAdapter(dataAdapter);

    }


}

However, whenever I click the "new" button in Fragment A, Serializable is not sent, and when fragment B begins, it is checked whether it is an object to be edited or a new one. When this happens the system gives me the following error:

 FATAL EXCEPTION: main
 Process: com.example.cabral.irriga, PID: 24858
 java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.Serializable android.os.Bundle.getSerializable(java.lang.String)' on a null object reference
 at com.example.cabral.irriga.CadastroAlarmFragment.onCreateView(CadastroAlarmFragment.java:90)

That is exactly in the verification where I need to know if it is a new one, or if it is to be edited, since Serializable is empty the error happens. So is there any other way for me to accomplish this task? Since in Activities I can send an empty intent and do the same job tried above? Any other suggestions for solving the case?