ANDROID QRScan crashes when returns to Fragment

//  The problem that I am having is when I call a QRCODE scan from a fragment, the app crashes when it returns to the fragment.  It scans perfectly well, but I think the problem lies at:
//****************   this is where I think the problem is....
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 have this same code running from another app with an activity and only two fragments.
I would try to run this in an emulator, but Emulators don't have cams.
//==============================================================================



package com.techlatin.loge;

import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
import android.widget.Button;
import android.widget.TextView;

public class ZZE_NewLocations extends ActionBarActivity {

    String session_id;
    String session_name;

    String Lat;
    String Lng;
    String zzBINIDQR;

    String ErrorText;
    Boolean thereWasAnError = false;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_zze__new_locations);

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment())
                    .commit();
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.zze__new_locations, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_zze__new_locations, container, false);
            return rootView;
        }
    }

    //==========================================================

    private  boolean resumeHasRun = false;
    @Override
    protected void onResume(){

        //Button btnst01 = (Button) findViewById(R.id.btnStep1_submit);
        //btnst01.setEnabled(false);

        super.onResume();
        if (!resumeHasRun){
            resumeHasRun = true;
            //return;
        }
        //  get the session stuff here

        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            session_id = extras.getString("session_id");
            session_name = extras.getString("session_name");

            final TextView xxSESSION_NAME = (TextView) findViewById(R.id.tvSESSION_NAME01);
            xxSESSION_NAME.setText(session_name);

            final TextView xxSESSION_ID = (TextView) findViewById(R.id.tvSESSION_ICD01);
            xxSESSION_ID.setText(session_id);

        }

        Do_WHATABOUT_ZZE();

    }

    private void Do_WHATABOUT_ZZE(){
        //  will explain what this screen is about
        TextView tv_zze_WhatAbout = (TextView) findViewById(R.id.tv_ZZE_WHAT_ABOUT);
        tv_zze_WhatAbout.setText("This screen is for NEW deployments of Existing and New Assets.  You should use this screen only ONCE per Asset.");
    }



   //================================================================
    //QRCode Reading


    public void btnZZZB_STEP01_SCAN01_click (View view){
        Intent intent = new Intent("com.google.zxing.client.android.SCAN");
        //intent.putExtra("SCAN_MODE", "PRODUCT_MODE");//for Qr code, its "QR_CODE_MODE" instead of "PRODUCT_MODE"
        intent.putExtra("SCAN_MODE", "QR_CODE_MODE");//for Qr code, its "QR_CODE_MODE" instead of "PRODUCT_MODE"
        intent.putExtra("SAVE_HISTORY", false);//this stops saving ur barcode in barcode scanner app's history
        startActivityForResult(intent, 0);
    }


//****************   this is where I think the problem is....
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 0) {
            if (resultCode == RESULT_OK) {
                //String contents =  data.getStringExtra("SCAN_RESULT"); //this is the result

             //   zzBINIDQR = data.getStringExtra("SCAN_RESULT");


             //   TextView tvtest000 = (TextView) findViewById(R.id.tvBINID_QR);
             //   tvtest000.setText(BINID_QR);
             //   tvtest000.setBackgroundColor(Color.GREEN);

                //BINID_QR = contents;

                //Button btnst01a = (Button) findViewById(R.id.btnStep1_submit);
                //btnst01.setEnabled(true);

            }
            else if (resultCode == RESULT_CANCELED) {
                // Handle cancel
                //Button btnst01 = (Button) findViewById(R.id.btnStep1_submit);
                //btnst01.setEnabled(false);

                zzBINIDQR = "---  no result ---";


             //   TextView tvtest000 = (TextView) findViewById(R.id.tvBINID_QR);
             //   tvtest000.setText(BINID_QR);
             //   tvtest000.setBackgroundColor(Color.RED);

            }
        }
    }



//========================  FRAGMENTS  ===============================
    public void btnClick_zze_01__loc_id(View view){

        setContentView(R.layout.fragment_zze_01__loc_id);

    }




    //========================  FRAGMENTS  ===============================
    public void btnClick_zze_09__return(View view){

        setContentView(R.layout.fragment_zze__new_locations);

    }


}