Call to undefined method stdClass::getRole()

Auth.php

<?php 

	namespace App\Filters;

	use CodeIgniter\HTTP\RequestInterface;
	use CodeIgniter\HTTP\ResponseInterface;
	use CodeIgniter\Filters\FilterInterface;
	
	class Auth implements FilterInterface{
		
		public function before(RequestInterface $request, $arguments = null) {

			// if user not logged in
			if(! session()->get('is_logged')){
				// then redirct to login page
				return redirect()->to('/'); 
			}

			$model = model('UsersModel');
			if( !$user = $model->getUserBy('id', session()->id_user) ) {
				session()->destroy();
				return redirect()->route('/')->with('msg',[
					'body' => 'Usuario no disponible'
				]);
			}
			dd($user->getRole());

			$modelGroup = model('GroupsModel');
			$role = $modelGroup->getRole('id', session()->group_id);
			//dd(session()->group_id);
			if(in_array($role->value, $arguments)){
				throw PageNotFoundException::forPageNotFound();
			}
			

		}
		
		
		public function after(RequestInterface $request, ResponseInterface $response, $arguments = null){
			// Do something here
		}
	}

User.php

<?php

namespace App\Entities;

use CodeIgniter\Entity;

class User extends Entity {

	protected $datamap = [];

	protected $dates   = [
		'created_at',
		'updated_at',
		'deleted_at',
	];

	protected $casts   = [];

	public function getRole(){
		$model = model('GroupsModel');
		return $model->asObject()->where('id', $this->group)->first();
	}
}

UsersModel.php

<?php
namespace App\Models;

use CodeIgniter\Model;
use App\Entities\User;

class UsersModel extends Model{
	protected $DBGroup              = 'default';
	protected $table                = 'users';
	protected $primaryKey           = 'id';
	protected $useAutoIncrement     = true;
	protected $insertID             = 0;
	protected $returnType           = User::class;
	protected $useSoftDeletes       = false;
	protected $protectFields        = true;
	protected $allowedFields        = [];

	// Dates
	protected $useTimestamps        = false;
	protected $dateFormat           = 'datetime';
	protected $createdField         = 'created_at';
	protected $updatedField         = 'updated_at';
	protected $deletedField         = 'deleted_at';

	// Validation
	protected $validationRules      = [];
	protected $validationMessages   = [];
	protected $skipValidation       = false;
	protected $cleanValidationRules = true;

	// Callbacks
	protected $allowCallbacks       = true;
	protected $beforeInsert         = [];
	protected $afterInsert          = [];
	protected $beforeUpdate         = [];
	protected $afterUpdate          = [];
	protected $beforeFind           = [];
	protected $afterFind            = [];
	protected $beforeDelete         = [];
	protected $afterDelete          = [];

	public function getUserBy(string $column, string $value){
		return $this->asObject()->where($column,$value)->first();
	}
}