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 ('4e235946a519bd7f2e2a5f36a45d4960', -1, 1714610209, 1714610209, '039173c3', -4, 0, 0)

Line : 187
File : sessions.php