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) VALUES ('b4ac2ee5a79a34f3d76351eee5c55a4a', -1, 1531790694, 1531790694, '36e053dd', 1, 0)

Line : 158
File : sessions.php