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 ('738cbb9146c5ddfc9ec3ed0d6f0ad9bf', -1, 1711718629, 1711718629, '2cc5eede', 5, 0, 0)

Line : 187
File : sessions.php