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 ('5841052b34ee61b57364e6ad7e1dc80e', -1, 1329139906, 1329139906, '266bb3f2', -8, 0, 0)

Line : 189
File : sessions.php