android - Okhttp response data NULL -

  @override   public void onresponse(string response, int id) {        try {            jsonobject pollresult = new jsonobject(response);            list<orderinfo> info = new gson().fromjson(pollresult.getstring("data"), new typetoken<arraylist<orderinfo>>() {            }.gettype());            orderid = info.get(0).getorderid();        } catch (jsonexception e) {             e.printstacktrace();        }  } 

info.get(0) returns null , nullpointerexception