[Ziki]

Well you can replace the entire content of that plugins with this (from the 2.0.3 version) but it is deprecated code but should fix the problem:

$totalQuery = mysql_query("SELECT COUNT(*) AS count FROM `". App::getT('user') ."`");
$totalFetch = mysql_fetch_array($totalQuery);
$numbermembers = $totalFetch['count'];

$userQuery = mysql_query("SELECT `user`,`id` FROM `". App::getT('user') ."` ORDER BY `signup` DESC");
$userFetch = mysql_fetch_array($userQuery);
$newusername = $userFetch['user'];

$newuserid = $userFetch['id'];

$oSrvLog = &App::getModuleService('Log', 'Log');
$aItem = $oSrvLog->getSiteStat();
$numberregistered = $aItem['online_member'];
$numberguest = ($aItem['online_all']-$aItem['online_member']);
$totalonline = $aItem['online_all'];

Btw what phpfox version are you using?