User's can't register* datdabse error
 

Whenever someone tries to register* they get a database error at the end* making their accoutns unusable* while the said profiles do appear as new registrations* however clicking on their usernames/profiles results in the following error.

Database error in vBulletin 3.8.3:

Invalid SQL:
INSERT INTO logins (userid* username* ipaddress* phpdate* logintype) VALUES (* 'Lein'* '69.180.32.189'* 1261437692* '');

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 ' 'Lein'* '69.180.32.189'* 1261437692* '')' at line 1
Error Number : 1064
Request Date : Monday* December 21st 2009 @ 11:21:32 PM
Error Date : Monday* December 21st 2009 @ 11:21:32 PM
Script : http://pakistandefence.net/forums/login.php?do=login
Referrer : http://www.pakistandefence.net/forums/
IP Address : 69.180.32.189
Username : Lein
Classname : vB_Database_MySQLi
MySQL Version :

or something like this

Database error in vBulletin 3.8.3:

Invalid SQL:

SELECT user.userid* user.username* user.usergroupid* user.displaygroupid* profilevisitor.visible

FROM profilevisitor AS profilevisitor
INNER JOIN user AS user ON (user.userid = profilevisitor.visitorid)

WHERE profilevisitor.userid = 53
AND (visible = 1 OR profilevisitor.visitorid = )

ORDER BY profilevisitor.dateline DESC
LIMIT 10;

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 ')

ORDER BY profilevisitor.dateline DESC
LIMIT 10' at line 7
Error Number : 1064
Request Date : Tuesday* December 22nd 2009 @ 09:48:13 PM
Error Date : Tuesday* December 22nd 2009 @ 09:48:13 PM
Script : http://pakistandefence.net/forums/members/vinod2070.html
Referrer : http://pakistandefence.net/forums/
IP Address :
Username : Singh
Classname : vB_Database_MySQLi
MySQL Version :

This only happens when trying to access these 'new' accounts* and when I try deleting them from the admincp* they still don't go away. Please help as I've got no idea what's just happened.