Database error in vBulletin 3.5.4: Error Number : 1062

[s2kinteg916]

Database error in vBulletin 3.5.4:

Invalid SQL:
INSERT INTO adv_gallery_customfields_entries (imgid ) VALUES (4 );

MySQL Error : Duplicate entry '4' for key 1
Error Number : 1062
Date : Sunday, May 7th 2006 @ 06:28:24 PM
Script : http://domain.com/gallery/upload.php
Referrer : http://domain.com.com/gallery/upload.php?&c=6

Username : admin
Classname : vb_database

[dcpaq2]

Im experiencing this same error, anyone know what causes this?

Thanks

Doug