SQL info: MySQL Query Error

Time: 2008-12-2 1:38pm
Script: /room.php

SQL: INSERT INTO t_session (sid,uid,islogin,isadmin, updated, sessiondata ) VALUES ('d39f06','','','', '1228196333', 'a:0:{}')
Error: Duplicate entry 'd39f06' for key 1
Errno.: 1062