phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('5ffddd711bace9a3841967f79f6e5de9', -1, 1257629133, 1257629133, '266bbf56', 16, 0, 0)

Line : 234
File : sessions.php