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 ('053c4e97e0a8589e7e7370b759d2d1d0', -1, 1329418636, 1329418636, '266bb3d2', -1, 0, 0)

Line : 189
File : sessions.php