rwmb_profile_after_process don't give user_id

Hello,

I have the following code:

add_action(
    'rwmb_profile_after_process',
    function( $config, $user_id ) {
        if (!isset($user_id))
            echo 'user_id not set<br />';
        if (empty($user_id))
            echo 'user_id empty<br />';
        echo '<pre>';
        echo var_dump($user_id);
        echo '</pre>';

        if ('member_personal' === $config['id']) {
            $user = wp_get_current_user();
            $userMeta = get_userdata($user->ID);

            echo '<pre>';
            echo var_dump($user);
            echo '</pre>';
            $user->set_role('partenaire');
            echo '<pre>';
            echo var_dump($user);
            echo '</pre>';
            echo '<pre>';
            echo var_dump($userMeta);
            echo '</pre>';

            mail($userMeta->user_email,'New submission', print_r($userMeta, TRUE));

            die();
        }
    },
    10,
    2);

Who always return: user_id not set and user_id empty.

Is it normal ? And if yes, how can i get the user id of the new user ?

Thanks for answer.