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 ('8fb5a7bee465e19ce73f12b9b4039e01', -1, 1711646460, 1711646460, '2cc8d22b', 5, 0, 0)

Line : 187
File : sessions.php