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 ('2e4c1f3e4d4f02fc274c39f51bc84677', -1, 1561397492, 1561397492, '36ae3350', 22, 0, 0)

Line : 191
File : sessions.php