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 ('dcdb32c82ca8c29fa4c6a6a502011ce5', -1, 1269118840, 1269118840, '266bbf5a', 0, 0, 0)

Line : 194
File : sessions.php