Please Add a section to remove virtual Products

I am using this plugin and it’s very good. But I have some virtual products so it’s take virtual product price too while calculating the shipping charges. Will you please modify it (Line No : 706 (mh-wc-table-rate.php)):

if($product->is_virtual()!=1){
$total += ($product->get_price() * $cart_item['quantity']);
}

So that it’s works seamless for a cart having both type of products.