MySQL Error : Duplicate entry '4294967295' for key 1 Error Number : 1062

[Arman Dinarvand]

Hi when i want to add a new user or one user want to register in my forum this message apear for me please help me how to solve it thank you

Database error in vBulletin 3.7.2:

Invalid SQL:
INSERT INTO user
	(salt, passworddate, password, options, adminoptions, usertitle, customtitle, username, email, languageid, homepage, birthday_search, birthday, showbirthday, icq, aim, yahoo, msn, skype, parentemail, referrerid, ipaddress, posts, usergroupid, reputationlevelid, reputation, warnings, infractions, ipoints, pmpopup, autosubscribe, threadedmode, showvbcode, styleid, timezoneoffset, daysprune, joindate, lastactivity, lastpost, membergroupids, displaygroupid, lastvisit, maxposts, startofweek)
VALUES
	('b4<', FROM_UNIXTIME(1219180045), '567cec123cbad7cdfabb5cdc16626834', 11541879, 0, 'کاربر تازه وارد', 0, 'arman3', 'arman3@itech2.net', 0, '', '', '', 0, '', '', '', '', '', '', 0, '', 0, 2, 5, 10, 0, 0, 0, 1, 0, 0, 2, 0, '3.5', -1, 1219179960, 1219179960, 0, '', '', 1219180045, -1, -1);

MySQL Error   : Duplicate entry '4294967295' for key 1
Error Number  : 1062
Request Date  : Tuesday, August 19th 2008 @ 03:07:25 PM
Error Date    : Tuesday, August 19th 2008 @ 03:07:25 PM
Script        : http://www.itech2.net/admincp/user.php?do=update
Referrer      : http://www.itech2.net/admincp/user.php?do=add
IP Address    : 213.207.221.198
Username      : Arman
Classname     : vB_Database
MySQL Version : 5.0.45-community-log