[mindhunter77]

I keep getting this on my forum, is there anyway to fix this or maybe disable the visitor log?

Database error in vBulletin 3.8.7:

Invalid SQL:
SELECT count(*) as num,floor((1340668799-dateline)/604800) as week FROM vbwwu002visitlog WHERE 

(userid=1)AND(dateline>=1338249600) GROUP BY week ORDER BY week;

MySQL Error   : BIGINT UNSIGNED value is out of range in '(1340668799 - 

`bbq`.`vbwwu002visitlog`.`dateline`)'
Error Number  : 1690
Request Date  : Tuesday, June 26th 2012 @ 03:26:56 PM
Error Date    : Tuesday, June 26th 2012 @ 03:26:57 PM
Script        : .com/forum/
Referrer      : admincp/index.php?do=head
IP Address    : 71.
Username      : c
Classname     : vB_Database
MySQL Version : 5.5.24-0ubuntu0.12.04.1