مشکلی عجیب در برنامه

اینم کد Activity Search :

 public static void populateSearchFromServer(String searchItem) {
        ModuleWebservice module = new ModuleWebservice();
        ModuleWebservice.Listener listener = new ModuleWebservice.Listener() {

            @Override
            public void onDataReceive(String data) {
                Log.i("LOG", "Webservice Data: " + data);
                if (data != null) {
                    try {

                        search.clear();
                        JSONArray app= new JSONArray(data);
                        for (int i = 0; i < app.length(); i++) {
                            JSONObject object = app.getJSONObject(i);
                            StructApp Apps= new StructApp();
                            Apps.id = object.getLong("app_id");
                            Apps.name = object.getString("app_name");
                            Apps.ratingValue = (float) object.getDouble("app_rating");
                            Apps.logoUrl = object.getString("app_logourl");
                            Apps.year = object.getInt("app_year");
                            Apps.votes = object.getString("app_vote");

                            search.add(Apps);

                        }
                        adapter2.notifyDataSetChanged();

                    }

                    catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            }


            @Override
            public void onFail(int statusCode) {
                switch (statusCode) {
                    case ModuleWebservice.IO_EXCEPTION:
                        Log.i("LOG", "IO Exception");
                        break;

                    case ModuleWebservice.PROTOCOL_EXCEPTION:
                        Log.i("LOG", "PROTOCOL Exception");
                        break;

                    case ModuleWebservice.UNKNOWN_EXCEPTION:
                        Log.i("LOG", "UNKNOWN Exception");
                        break;
                }
            }
        };

        ArrayList<NameValuePair> input = new ArrayList<NameValuePair>();

        input.add(new BasicNameValuePair("searchItem", searchItem));
        module.url("http://192.168.1.51/app-server/search.php?action=readsearch", input)
                .inputArguments(input)
                .listener(listener)
                .cacheDir(G.DIR_CACHE)
                .enableCache(true)
                .cacheExpireTime(3)
                .connectionTimeout(3000)
                .socketTimeout(5000)
                .read();

    }


    public class LoadingTask extends AsyncTask<String, Void, String>
    {

        @Override
        protected String doInBackground(String... params) {

            SerachItem = edtSearchItem.getText().toString();
            populateSearchFromServer(SerachItem);

            return null;
        }


        @Override
        protected void onPreExecute() {
            mProgressDialog = new ProgressDialog(ActivitySearch.this);
            mProgressDialog.setMessage("لطفا صبر کنید...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();
            mProgressDialog.setCancelable(false);
            super.onPreExecute();
        }


        @Override
        protected void onPostExecute(String result) {
            mProgressDialog.dismiss();
            runOnUiThread(new Runnable() {

                @Override
                public void run() {
                    /**
                     * Updating parsed JSON data into ListView
                     * */
                    adapter2 = new AdapterSerials(search);
                    listSearch.setAdapter(adapter2);
                }
            });

        }


        protected void onResume() {

            adapter2.notifyDataSetChanged();
        }

    }