SQL info: MySQL Query Error

Time: 2008-10-7 7:20pm
Script: /scenery/article.php

SQL: INSERT INTO t_session (sid,uid,islogin,isadmin, updated, sessiondata ) VALUES ('b8b017','','','', '1223378459', 'a:0:{}')
Error: Duplicate entry 'b8b017' for key 1
Errno.: 1062