Laravel Guzzle conflicts with /register Route::auth() - laravel

Question

I'm new to use Laravel. I'm using Laravel 5.2. I've implemented Auth for user register and login. It is work properly. After installed Guzzle via composer and after that implementing sending email, it works like a charm. But after try to submit register user, the data which sent via POST form, not saved in table. How to keep data recorded in table meanwhile sending email still works?
AuthController for handling user registration:
<?php
namespace App\Http\Controllers\Auth;
use App\User;
use App\PencapaianBadge;
use DB;
use Validator;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\ThrottlesLogins;
use Illuminate\Foundation\Auth\AuthenticatesAndRegistersUsers;
class AuthController extends Controller
{
/*
|--------------------------------------------------------------------------
| Registration & Login Controller
|--------------------------------------------------------------------------
|
| This controller handles the registration of new users, as well as the
| authentication of existing users. By default, this controller uses
| a simple trait to add these behaviors. Why don't you explore it?
|
*/
use AuthenticatesAndRegistersUsers, ThrottlesLogins;
/**
* Where to redirect users after login / registration.
*
* #var string
*/
protected $redirectTo = '/';
/**
* Create a new authentication controller instance.
*
* #return void
*/
public function __construct()
{
$this->middleware($this->guestMiddleware(), ['except' => 'logout']);
}
/**
* Get a validator for an incoming registration request.
*
* #param array $data
* #return \Illuminate\Contracts\Validation\Validator
*/
protected function validator(array $data)
{
return Validator::make($data, [
'first_name' => 'required|max:255',
'last_name' => 'required|max:255',
'username' => 'required|max:10|unique:users',
'email' => 'required|email|max:255|unique:users',
'password' => 'required|min:6|confirmed',
]);
}
/**
* Create a new user instance after a valid registration.
*
* #param array $data
* #return User
*/
protected function create(array $data)
{
//Ambil id user dengan menhitung jumlah rows
$id = DB::table('users')->count();
/*PencapaianBadge::create([
'id_user' => $id+1,
'id_badge' => 1,
]);*/
$Pencapaian = new PencapaianBadge();
$Pencapaian->id_user = $id+2;
$Pencapaian->id_badge = 1;
$Pencapaian->save();
return User::create([
'first_name' => $data['first_name'],
'last_name' => $data['last_name'],
'username' => $data['username'],
'email' => $data['email'],
'password' => bcrypt($data['password']),
'role_id' => 2,
'path_image' => 'main/resources/assets/images/user_profiles/default.png',
]);
}
}