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 ('93ca42b5973c3f3dc513be232636e6c8', -1, 1571222112, 1571222112, '22ccbf1f', -9, 0, 0)

Line : 191
File : sessions.php