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 ('50e56672d5c7a7c6a2fa070798ce6861', -1, 1756673239, 1756673239, 'd849d8b2', -9, 0, 0)

Line : 187
File : sessions.php