u.mail,
                u.forename,
                u.surname,
-               IFNULL(g.id, :guestid) AS g_id,
-               IFNULL(g.title, :guesttitle) AS g_title
+               g.id AS g_id,
+               g.title AS g_title
        FROM RapsysUserBundle:User AS u
        LEFT JOIN RapsysUserBundle:UserGroup AS gu ON (gu.user_id = u.id)
        LEFT JOIN RapsysUserBundle:Group AS g ON (g.id = gu.group_id)
                        ->addScalarResult('mail', 'mail', 'string')
                        ->addScalarResult('forename', 'forename', 'string')
                        ->addScalarResult('surname', 'surname', 'string')
-                       ->addScalarResult('g_id', 'g_id', 'integer')
                        ->addScalarResult('g_title', 'g_title', 'string');
 
                //Fetch result
                //Process result
                foreach($res as $data) {
                        //Get translated group
-                       $group = $this->translator->trans($data['g_title'], [], $this->alias);
+                       $group = $this->translator->trans($data['g_title']?:'Null', [], $this->alias);
 
                        //Init group subarray
                        if (!isset($ret[$group])) {