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 ('8aec9f8386c148e9f59b967d16508dfa', -1, 1714044348, 1714044348, '12da3d10', -4, 0, 0)

Line : 187
File : sessions.php