在onMessage（）上收到推送通知时执行一些代码

This is my code, and I have to execute some http request in an AsyncTask when a push notification is received. As I understood if I need to do something when a push notification arrives, I have to do it within the OnMessage() method. However the app crashes when it receives the notification and does not do what I need it to do: Code:

@Override
protected void onMessage(Context context, Intent intent) {
    Log.i(TAG, "Received message");
    String message = intent.getExtras().getString("price");
    //sends info to the server

    new PostAsyncTask().execute();

    displayMessage(context, message);
    // notifies user
    generateNotification(context, message);
}

Thank you very much! (In case you need the whole class just say it. However I can tell you that the PostAsyncTask executes some httpRequest code.)

Logcat:

http://pastebin.com/LggC0uFq

AsyncTask: (It just calls a function that executes some http request)

class PostAsyncTask extends AsyncTask<String, Integer, Boolean> {
     protected Boolean doInBackground(String... params) {
        ReNewCoordinates();
         postData(lat, lon);
            return true;

     }

     protected void onPreExecute() {
         // show progress dialog
     }


         protected void onPostExecute(Long result) {
             // hide  progress dialog
         }
     }