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) VALUES ('6ec4b984fa2ed4d8a1d1979735e5a8dc', -1, 1604061785, 1604061785, '22c90913', -4, 0)

Line : 158
File : sessions.php