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 ('8abb6b5e3e2871489a0886f07728baea', -1, 1714007361, 1714007361, '12d9b62d', -4, 0, 0)

Line : 187
File : sessions.php