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 ('2f178544d2f27f7b25635d04b9cd616d', -1, 1714003699, 1714003699, '039183ee', -4, 0, 0)

Line : 187
File : sessions.php