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 ('8e37277d46b9c409118e8dfcc1988ede', -1, 1329075152, 1329075152, '266bb3d3', -1, 0, 0)

Line : 189
File : sessions.php