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 ('fd34b18b40bd977b043a9074c2ff614e', -1, 1714016228, 1714016228, '0a020003', -9, 0, 0)

Line : 187
File : sessions.php