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 ('2d1f7d8a8e8e1f973b2d21e1906c9ae7', -1, 1714153288, 1714153288, '1276fe5e', 4, 0, 0)

Line : 187
File : sessions.php