A quick fix for you could be to go to
https://github.com/pi-hole/pi-hole/blob/master/advanced/index.php#L17
and change this to
$showPage = false;
A quick fix for you could be to go to
https://github.com/pi-hole/pi-hole/blob/master/advanced/index.php#L17
and change this to
$showPage = false;