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 ('416c22167087083d9c56a604390a6d07', -1, 1537372334, 1537372334, '36c6670d', 4, 0, 0)

Line : 187
File : sessions.php