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 ('f7bfc5c4bd67ec3a077301e0b321fca7', -1, 1714000452, 1714000452, '03913456', 5, 0, 0)

Line : 187
File : sessions.php