MySQL Error 1064

[The Equivocate]

I get this error when trying to view someone's profile:

Database error in vBulletin 3.0.7:

Invalid SQL:
SELECT user.avatarid, user.avatarrevision, avatarpath, NOT ISNULL(avatardata) AS hascustom, customavatar.dateline
FROM user AS user
LEFT JOIN avatar AS avatar ON avatar.avatarid = user.avatarid
LEFT JOIN customavatar AS customavatar ON customavatar.userid = user.userid
WHERE user.userid =
mysql error: You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 5

mysql error number: 1064

I've installed uShop, Trader Ratings, and vBookie, but I know for a fact that the profiles worked fine after installing uShop and TR. I went back and reinstalled vBookie but I'm still getting the same error.