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 ('975a2fe4c1caa3f80b5a69e933a3208a', -1, 1709092008, 1709092008, '2cc84d5c', -1, 0, 0)

Line : 187
File : sessions.php