Done but not fixed (also tried from a clean tor browser), code looks like this now:

function avia_extended_pagination_link( $method, $page_number, $query_arg = ” )
{
if( empty( $query_arg ) )
{
$url = $method( $page_number );
}
else
{
$url = add_query_arg( $query_arg, $page_number, $url );
}

return $url;
}