Problem with google placepicker api place

I'm implementing the api of google places in my application, I'm working with a bottom navigation as a menu, so I have different fragments that are the options, example home, search, settings, etc. Implement place picker in one of the fragments, and when executing and selecting that fragment in the app the map appears and everything, but it goes back to the main menu, I do not understand why, any idea ?. Greetings

As you can see in the image I select the option to search, the map opens but it comes out, as you can see in the image that is coming out

package com.example.larra21.myapplication;


import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.google.android.gms.common.GooglePlayServicesNotAvailableException;
import com.google.android.gms.common.GooglePlayServicesRepairableException;
import com.google.android.gms.location.places.Place;
import com.google.android.gms.location.places.ui.PlacePicker;

import static android.app.Activity.RESULT_OK;


/**
 * A simple {@link Fragment} subclass.
 */
public class BuscarFragment extends Fragment {

 int PLACE_PICKER_REQUEST = 1;
 public BuscarFragment() {
  // Required empty public constructor
 }


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

  PlacePicker.IntentBuilder builder = new PlacePicker.IntentBuilder();
  Intent intent;
  try {
   intent = builder.build(getActivity());
   startActivityForResult(intent, PLACE_PICKER_REQUEST);
  } catch (GooglePlayServicesRepairableException e) {
   e.printStackTrace();
  } catch (GooglePlayServicesNotAvailableException e) {
   e.printStackTrace();
  }

  return v;



 }

 public void onActivityResult(int requestCode, int resultCode, Intent data) {
  if (requestCode == PLACE_PICKER_REQUEST) {
   if (resultCode == RESULT_OK) {
    Place place = PlacePicker.getPlace(data, getActivity());
    String toastMsg = String.format("Place: %s", place.getName());
    Toast.makeText(getActivity(), toastMsg, Toast.LENGTH_LONG).show();
   }
  }
 }

}