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 ('ca93e4868a9b65619d095bdf46ab94ea', -1, 1223337594, 1223337594, 'd1eaab27', 3, 0, 0)

Line : 189
File : sessions.php