Fetch_array alternative for PHP prepared statements

UPDATE

$stmt = $this->db->prepare("

SELECT u.id,    u.fname,    u.lname,    u.mname,  u.type, u.email, u.salt,

       u.pass,  u.salt,     u.approved, u.ban,      u2.status

FROM `users` AS u

    LEFT OUTER JOIN `log` AS u2

        ON u2.user_id = u.id

WHERE u.email = ? LIMIT 1") or die($this->db->error);



        $stmt->bind_param("s", $_POST['email']) or die($stmt->error);

        $stmt->execute();

        $stmt->store_result();

        if ($stmt->num_rows == 0) {

            die($this->ajax->respond(7));

        }

        $result = $stmt->get_result();

        $data = $result->fetch_array(MYSQLI_BOTH);

Trying to fetch array but getting following error for last line

Fatal error: Call to a member function fetch_array() on a non-object

Can't get it work. Please help