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 ('eff8cf0ec7b0f2d13c0ef456341be84a', -1, 1566506035, 1566506035, '12e8ab12', 16, 0, 0)

Line : 189
File : sessions.php