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 ('939ede986d53d7b3e2197f32bdc92160', -1, 1757040265, 1757040265, 'd849d80f', 19, 0, 0)

Line : 247
File : sessions.php