phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('a165cbc5ecfcb8b150f5e15c4b9e1fb5', -1, 1371599014, 1371599014, '43ca09c0', -1, 0, 0)

Line : 173
File : sessions.php