SonataAdminBundle: Checkbox input not showing (for users : enabled and roles)

Hi, i’m working on a symfony 2.6 project and i have my user entity that extends fos user bundle and i want the admin to be able to enable or disable a user and chose the user’s role in the configuration pannel.

The problem is that the checkbox appear for 0.2 sec and disapear

Sonata version : sonata-project/admin-bundle dev-master 25f7ebe Symfony SonataAdminBundle Symfony version : symfony/symfony v2.6.13 The Symfony PHP framework Php version : PHP 5.5.9-1ubuntu4.16 (cli) (built: Apr 20 2016 14:31:27)

Here is a part of the User class

use FOS\UserBundle\Entity\User as BaseUser;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;

class User extends BaseUser {

public function __construct() {
        parent::__construct();
        $this->enabled = true;
        $this->addRole('ROLE_ADMIN');
        $this->setPlainPassword('patate');
    }
...
}

Here’s the form in UserAdmin

`protected function configureFormFields(FormMapper $formMapper) {

    if (!$this->getSubject()->getId()) {
        $formMapper
            ->with('user_edit_section_general')
            ->add('username', null, array('label' => 'user_username', 'help' => "user_username_help"))
            ->end()
        ;
    }

    $formMapper
        ->with('user_edit_section_profile')
        ->add('firstname', null, array('label' => "user_firstname"))
        ->add('lastname', null, array('label' => "user_lastname"))
        ->add('email', null, array('label' => 'user_email'))
        ->add('service', 'entity', array(
            'label'       => 'user_service',
            'class'       => 'IEPAPCGestionBundle:Service',
            'required'    => false,
            'placeholder' => 'user_service_default',
            'empty_data'  => null,
        ))
        ->end()

        ->with('user_edit_section_management')
        ->add('roles', 'sonata_security_roles', array(
            'expanded' => true,
            'multiple' => true,
            'required' => true,
            'choices'  => array(
                'ROLE_ADMIN'         => 'user_role_admin',
                'ROLE_ADMIN_CHIEF'   => 'user_role_admin_chief',
                'ROLE_ADMIN_RH'      => 'user_role_admin_rh',
                //'ROLE_ADMIN_FINANCE' => 'user_role_admin_finance',
                'ROLE_SUPER_ADMIN'   => 'user_role_super_admin',
            ),
            'label'    => 'user_edit_roles',
            'help'     => 'user_roles_help',
        ))
        ->add('enabled', 'checkbox', array(
            'label'    => 'user_enabled',
            'help'     => 'user_enabled_help',
            'required' => false,
        ))

        ->end()
    ;
}`

Thank you and i’m available if you need more information.