Database errors

[BernieK]

Ive contacted the hosts of my forum and opened a ticket concerning the database errors i have been receiving, they have ended up suggesting i contact someone on here about it,

I am getting the message below when i try to quote or reply to a thread, any help would be greatly appreciated.

Database error in vBulletin 4.2.0:

Invalid SQL:

SELECT post.*, IF(post.userid = 0, post.username, user.username) AS username
FROM post AS post
LEFT JOIN user AS user ON (user.userid = post.userid)
WHERE post.visible = 1
AND post.userid NOT IN (62.6.169.133)
AND post.threadid = 9993
ORDER BY dateline DESC
LIMIT 26;

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 '.169.133)
AND post.threadid = 9993
ORDER BY dateline DESC
LIMIT 26' at line 5
Error Number : 1064
Request Date : Thursday, April 25th 2013 @ 03:48:30 PM
Error Date : Thursday, April 25th 2013 @ 03:48:31 PM
Script :
Referrer :
IP Address :
Username :
Classname : vB_Database
MySQL Version : 5.5.29-log