SQL error in do_update(): INSERT INTO tbl_ws_session ( session_id, time_created, time_expires ) VALUES ( 'f807da99bd9277c374153904d3938691','2010-09-08 11:19:51','2010-09-08 13:19:51'): Duplicate entry 'f807da99bd9277c374153904d3938691' for key 1