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 ('4985ca7d1c34a04ca39c4906fbc2406e', -1, 1560711840, 1560711840, '22e57e1d', 26, 0, 0)

Line : 191
File : sessions.php