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 ('c9d0a8962bd71a11e89bf3f6b92fe3e6', -1, 1369296452, 1369296452, '1714c4b3', 3, 0, 0)

Line : 187
File : sessions.php