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 ('dd39aba00723d9c9046667a131cb49d1', -1, 1729228556, 1729228556, '12742ae9', -2, 0, 0)

Line : 172
File : sessions.php