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 ('74af67e58ca64d1d0a0d02d1e3bf9089', -1, 1708583318, 1708583318, '2cc84d5c', -7, 0, 0)

Line : 187
File : sessions.php