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 ('18f0136cae9a3c2b1ba4c45ef1eb45b0', -1, 1713943655, 1713943655, '0391177b', -7, 0, 0)

Line : 187
File : sessions.php