steamAuth errorException

[BALTO245]

hy,

i want to start a website which requires you to login in into steam...but then i get this error:

ErrorException in SteamAuth.php line 206:
Undefined offset: 1

it has something to do with the following code:

public function parseSteamID()
{
    preg_match("#^http://steamcommunity.com/openid/id/([0-9]{17,25})#", $this->request->get('openid_claimed_id'), $matches);
    $this->steamId = is_numeric($matches[1]) ? $matches[1] : 0;
}

at first i thought it had something to do with my steam API...but i tried switching accounts and the same error came up.