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 ('2055c6c45e660059a8e5bb70f56e5565', -1, 1714008910, 1714008910, '2cc961e0', -7, 0, 0)

Line : 187
File : sessions.php