COD4: !pbver function (punkbuster.php) doesn't work since punkbuster server v1.754

pb_sv_ver
PunkBuster: PunkBuster Server for COD4 (v1.754 | A1407 C2.207) Enabled

private function pb_ver() {
        $return = $this->rcon->rcon("pb_sv_ver");
        $pattern = '#^.*?: Punkbuster Server.*?\((.*?) \| (.*?) (.*?)\) Enabled$#i';
        preg_match($pattern, $return, $subpatterns);
        return array($subpatterns[1], $subpatterns[2], $subpatterns[3]);
    }