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 ('53c85c2447aac4c520731d9d0bf8b360', -1, 1495647219, 1495647219, '36a2a8bb', -9, 0, 0)

Line : 189
File : sessions.php