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 ('d6f1248e2f637d46f08d3d94f9b0a9a1', -1, 1711627565, 1711627565, 'b84887d2', 0, 0, 0)

Line : 187
File : sessions.php