a bue urgente MOD-post_icons error

[marmol]

La linea del viewforum tengo esto

//
// End of forum prune
//

//
// Obtain list of moderators of each forum
// First users, then groups ... broken into two queries
//
$sql = "SELECT u.user_id, u.username
FROM " . AUTH_ACCESS_TABLE . " aa, " . USER_GROUP_TABLE . " ug, " . GROUPS_TABLE . " g, " . USERS_TABLE . " u
WHERE aa.forum_id = $forum_id
AND aa.auth_mod = " . TRUE . "
AND g.group_single_user = 1
AND ug.group_id = aa.group_id
AND g.group_id = aa.group_id
AND u.user_id, u.user_level = ug.user_id
GROUP BY u.user_id, u.username
ORDER BY u.user_id";
if ( !($result = $db->sql_query($sql)) )
{
message_die(GENERAL_ERROR, 'Could not query forum moderator information', '', __LINE__, __FILE__, $sql);
}