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 ('78693afa5b665bd2c5e23dd98314a99e', -1, 1713457755, 1713457755, '12742ad0', -11, 0, 0)

Line : 187
File : sessions.php