[Xenon]

that's why i said you need a static variable to run it just once

PHP Code:

static $alreadychecked, $check;

if (!$alreadychecked)
{
$checkdata = $db->query_read("
                SELECT dateline
                FROM " . TABLE_PREFIX . "custom
                WHERE userid = " . $vbulletin->userinfo['userid'] . "
                        AND threadid = " . intval($threadid)
        );

        if ($db->num_rows($checkdata))
        {
                $check = true;
        }
        else
        {
                $check = false;
        }
$alreadychecked = true;
}