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 ('b2b91c3451a961bafb1973717ba7d9e0', -1, 1711727932, 1711727932, '035b0b1e', -4, 0, 0)

Line : 187
File : sessions.php