phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6afe4b7d1d6ec9e04f3e6772da082924', -1, 1556236741, 1556236741, '36eb04c4', 4, 0, 0)

Line : 187
File : sessions.php