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 ('0ce6c40fcf70c30c3ec92dd31db4d383', -1, 1542044006, 1542044006, '36a2a92d', 17, 0, 0)

Line : 193
File : sessions.php