Forum database error

[محروم.كوم]

Hello
my forums was working fine but but all of sudden i got this error
i dont know why this error happened and how to overcome this error

please guide me ..

Database error in vBulletin 4.2.0:

Invalid SQL:
INSERT INTO blog_user
(bloguserid, options, options_buddy, options_ignore, options_member, options_guest, subscribeown, subscribeothers, memberblogids, memberids)
VALUES
(1249, 6, 3, 0, 3, 3, 'email', 'email', '1249', '1249');

MySQL Error : Duplicate entry '1249' for key 1
Error Number : 1062
Request Date : Monday, January 7th 2013 @ 04:59:53 AM
Error Date : Monday, January 7th 2013 @ 0507 AM
Script : http://xxxxx.com/blog_post.php?do=updateblog&blogid=
Referrer : http://xxxxx.com/blog_post.php?do=newblog
IP Address : 111.111.11.11
Username : leseeaxia
Classname : vB_Database


Hope to have a guide soon .
Thanks & Best Regards __DEFINE_LIKE_SHARE__