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 ('3e1b6245a7b9d4be5fca538e16377a37', -1, 1531806660, 1531806660, '36a6e423', -4, 0, 0)

Line : 187
File : sessions.php