gistfile1.txt

add_filter( 'woocommerce_shortcode_products_query',
		function ( $query_args, $attributes, $type ) {
			if ( $type == 'best_selling_products' ) {

				unset( $query_args['meta_key'] );
				unset( $query_args['meta_query'] );

				add_filter( 'posts_clauses',
					function ( $args ) {

						$args['orderby'] = ' CASE wc_product_meta_lookup.min_price WHEN 0 THEN 1
	            ELSE -1
	            END ASC, wc_product_meta_lookup.total_sales DESC, wc_product_meta_lookup.product_id DESC
	        ';

						return $args;
					} );


			}

			return $query_args;
		}, 10, 3 );