I recon the problem is with this quiry in udb_base.inc.php
// Build SQL table, should work with all bridges
$sql = "SELECT {$f['user_id']} AS user_id, {$f['username']} AS user_name, {$f['email']} AS user_email, {$f['regdate']} AS user_r...
// Build SQL table, should work with all bridges
$sql = "SELECT {$f['user_id']} AS user_id, {$f['username']} AS user_name, {$f['email']} AS user_email, {$f['regdate']} AS user_r...