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 ('828455d976eab89c2d0a4e62fee63432', -1, 1490441338, 1490441338, '3691d0a0', 0, 0, 0)

Line : 187
File : sessions.php