Errors on new registrations

[محروم.كوم]

When a new user try to register an account it gives an error , although the account is created.

How can i fix it ? thanks


Quote:
Database error in vBulletin 3.8.2:

Invalid SQL:
INSERT INTO userfield
(userid)
VALUES
(1929);

MySQL Error : Duplicate entry '1929' for key 1
Error Number : 1062
Request Date : Tuesday, June 16th 2009 @ 0947 AM

Error Date : Tuesday, June 16th 2009 @ 0947 AM
Script : http://www.stylwolny.pl/register.php?do=addmember
Referrer : http://www.stylwolny.pl/register.php?do=register
IP Address :
Username : z1z1z1z1
Classname : vB_Database
MySQL Version : __DEFINE_LIKE_SHARE__