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 ('4ba51733ea336b01a477c53159bab05f', -1, 1579808735, 1579808735, '00000000', 0, 0)

Line : 152
File : /home/nlsb/public_html/forum/includes/sessions.php