Emulatore OK Smartphone No

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Emulatore OK Smartphone No

Sto testando la mia app sia su emulatore virtuale ed è Ok ma sul telefono parte ma quando devo fare una ricerca sol db mi da errore:
10-22 18:55:07.300 3205-3205/? E/AndroidRuntime: FATAL EXCEPTION: main
                                                 Process: com.example.paolo.myapplication, PID: 3205
                                                 java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toString()' on a null object reference
                                                     at com.example.paolo.myapplication.MainActivity$2.onErrorResponse(MainActivity.java:81)
                                                     at com.android.volley.Request.deliverError(Request.java:598)
                                                     at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:101)
                                                     at android.os.Handler.handleCallback(Handler.java:739)
                                                     at android.os.Handler.dispatchMessage(Handler.java:95)
                                                     at android.os.Looper.loop(Looper.java:158)
                                                     at android.app.ActivityThread.main(ActivityThread.java:7224)
                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Questo è il MainActivity:
public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private EditText eTNbusta,eTCosto, eTSearch;
    private String   str_nBusta,str_costo;
    private Button btnSearch,btnSalva;
    private ProgressDialog pdLoading ,pdUpdate;



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


        eTSearch = (EditText)findViewById(R.id.eTSearch);
        eTNbusta = (EditText)findViewById(R.id.eTCodice);
        eTCosto = (EditText)findViewById(R.id.eTCosto);

        btnSearch = (Button)findViewById(R.id.btnSearch);
        btnSearch.setOnClickListener(this);

        btnSalva = (Button)findViewById(R.id.btnSalva);
        btnSalva.setOnClickListener(this);



    }

    private void getData()
    {
        String Nbusta = eTSearch.getText().toString().trim();
        if (Nbusta.equals(""))
        {
            Toast.makeText(this,"Inserire Numero Busta",Toast.LENGTH_LONG).show();
            return;
        }
        pdLoading = ProgressDialog.show(this,"Attendere","Caricamento",false,false);
        String url = Config.DATA_URLCASA + eTSearch.getText().toString().trim();
        Log.d("Controllo_URL.....", url);
        final StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {

            @Override
            public void onResponse(String response)
            {

                pdLoading.dismiss();
                showJSON(response);
                Log.d("MYAPP", response);

            }


        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error)
            {
                Toast.makeText(MainActivity.this,error.getMessage().toString(),Toast.LENGTH_LONG).show();

            }
        });

        MySingleton.getInstance(this).addToRequestQueue(stringRequest);

    }


    private void showJSON(String response)
    {
        String nBusta ="";
        String costo = "";

        try {
            response.replaceFirst("\\r\\n1","");



            JSONObject jsonObject = new JSONObject(response);

            JSONArray result = jsonObject.getJSONArray("tabripa");
            JSONObject collegaData = result.getJSONObject(0);

            nBusta = collegaData.getString(Config.KEY_NBUSTA);
            costo = collegaData.getString(Config.KEY_COSTO);

        } catch (JSONException e) {
            e.printStackTrace();
        }
        eTNbusta.setText(nBusta);
        eTCosto.setText(costo);

    }

    public void update()
    {
        String nBusta = eTNbusta.getText().toString();
        String costo = eTCosto.getText().toString();

        Map<String,String> params = new HashMap<>();
        params.put("Nbusta", nBusta);
        params.put("costo",costo);

        Log.d("update.......", String.valueOf(params));


        CustomRequest update_request = new CustomRequest(Request.Method.POST, Config.DATA_UPDATE,
                params, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                Log.d("UpdateRisposta.......", String.valueOf(response));
                try{
                    int success = response.getInt("success");

                    if (success == 1) {

                        Toast.makeText(getApplicationContext(),
                                "Aggiornamento Riuscito",
                                Toast.LENGTH_SHORT).show();
                        // redirect to readdata
                       // MoveToReadData();

                    } else {

                        Toast.makeText(getApplicationContext(),
                                "Aggiornamento fallito", Toast.LENGTH_SHORT)
                                .show();
                    }
                }
                catch (Exception e){

                }

            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        });
        MySingleton.getInstance(this).addToRequestQueue(update_request);




    }


    @Override
    public void onClick(View v)
    {
        Button b = (Button) v;
        switch(b.getId()) {
            case R.id.btnSearch:
                getData();
                break;
            case R.id.btnSalva:
                update();
                break;

        }

    }
}

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