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 ('ada2fc95f3611848f721b1566f6a6deb', -1, 1713853638, 1713853638, '12bc3ddf', 6, 0, 0)

Line : 187
File : sessions.php