Issue: vBulletin Database Error! when making new forum post.

Database error in vBulletin 4.2.3:

Invalid SQL:
UPDATE forum SET
threadcount = threadcount - 1,
replycount = replycount - 1
WHERE forumid = 3;

MySQL Error : BIGINT UNSIGNED value is out of range in '(`aquawi5_vbulletin4`.`forum` .`threadcount` - 1)'
Error Number : 1690
Request Date : Sunday, July 5th 2015 @ 05:03:21 PM
Error Date : Sunday, July 5th 2015 @ 05:03:21 PM
Script : [url]http://www.aquawinds.com/forums/cont...ms-of-Use/edit[/url]
Referrer : [url]http://www.aquawinds.com/forums/cont...ms-of-Use/edit[/url]
Classname : vB_Database
MySQL Version : 5.6.23
PHP Version: 5.4.41