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I keep getting the database error:

Database error in vBulletin 3.6.4:

Invalid SQL:

UPDATE community_user AS user, community_post AS post
SET
`user.vbbux` = `user.vbbux` + `post.vbbux`
WHERE
post.threadid = '4441'
AND user.userid = post.userid;

MySQL Error : Unknown column 'user.vbbux' in 'field list'
Error Number : 1054
Date : Monday, January 22nd 2007 @ 10:05:34 AM
Script : http://www.domain.com/cron.php?rand=351986
Referrer : http://www.domain.com/online.php
IP Address :
Username :
Classname : vb_database

Any idea? how to fix it?