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 ('4b439d96958580b386e3ba4191b1fbb4', -1, 1714003297, 1714003297, '03814597', -9, 0, 0)

Line : 187
File : sessions.php