Database and SQL errors in Who's Online page.

[Laurvick]

Whenever I go to the Who's Online page, I get an error.

Invalid SQL:

SELECT IF(userid > 0, 1, 0) as isuser, COUNT(session.userid) as online_users
, user.market_username_color,
user.market_username_glow, market_username_subscript
FROM session as session

WHERE session.lastactivity > 1314829461

GROUP BY isuser;

MySQL Error : Unknown column 'user.market_username_color' in 'field list'
Error Number : 1054