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 ('c47401a256b2f9f9fd559d518135c9c8', -1, 1711670995, 1711670995, '03ee3e77', -4, 0, 0)

Line : 187
File : sessions.php