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 ('ca495f4c971f8cd95f196e745031ffb5', -1, 1711709904, 1711709904, '36af3bf2', -4, 0, 0)

Line : 187
File : sessions.php