Fix for registration and signed in.

gistfile1.txt

<?php

namespace App\Controller;

use CakeDC\Users\Controller\Traits\LoginTrait;
use CakeDC\Users\Controller\Traits\RegisterTrait;

class UsersController extends AppController {

    use RegisterTrait {
        register as traitRegister;
    }

    use LoginTrait;

    public function register()
    {
        if($this->Auth->user('id')) {
            return $this->redirect('/');
        }

        return $this->traitRegister();
    }
    
}