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 ('68a2ac978b58dc9dfe9d514735ad9c7d', -1, 1560677522, 1560677522, '0358dc5d', 1, 0, 0)

Line : 191
File : sessions.php