SQL info: MySQL Query Error

Time: 2008-10-7 10:00pm
Script: /scenery/scenery_pic.php

SQL: INSERT INTO t_session (sid,uid,islogin,isadmin, updated, sessiondata ) VALUES ('d9587a','','','', '1223388029', 'a:0:{}')
Error: Duplicate entry 'd9587a' for key 1
Errno.: 1062