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 ('491ea6b9d5e01fdf5bfca3e3b17ea2f0', -1, 1714064040, 1714064040, '038f0973', 6, 0, 0)

Line : 187
File : sessions.php