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 ('84699f9f8d5fe4c507bf0cc0f7f54463', -1, 1711618427, 1711618427, '2cc1507e', -8, 0, 0)

Line : 187
File : sessions.php