Erreur lorsqu'on vide le panier

function getShippingProductsData(&$order, $products = array()) {
		if(empty($order->shipping_prices)) {
			$order->shipping_prices = array();
		}

		if(!isset($order->shipping_prices[0])) {
			$order->shipping_prices[0] = new stdClass();

			$order->shipping_prices[0]->all_with_tax = $order->total->prices[0]->price_value_with_tax;
			if(isset($order->full_total->prices[0]->price_value_without_shipping_with_tax)) {
				$order->shipping_prices[0]->all_with_tax = $order->full_total->prices[0]->price_value_without_shipping_with_tax;
			}
			$order->shipping_prices[0]->all_without_tax = $order->total->prices[0]->price_value;
			if(isset($order->full_total->prices[0]->price_value_without_shipping)) {
				$order->shipping_prices[0]->all_without_tax = $order->full_total->prices[0]->price_value_without_shipping;
			}

			$order->shipping_prices[0]->weight = $order->weight;
			$order->shipping_prices[0]->volume = $order->volume;
			$order->shipping_prices[0]->total_quantity = $order->total_quantity;
		}

	function getMethods(&$order){
		$pluginClass = hikashop_get('class.plugins');
		$rates = $pluginClass->getMethods('shipping');

		if(bccomp($order->total->prices[0]->price_value,0,5) && !empty($rates)){
			$currencyClass = hikashop_get('class.currency');
			$currencyClass->convertShippings($rates);
		}
		return $rates;
	}

	function &getShippingGroups(&$order, &$rates) {
		if(!empty($order->shipping_groups))
			return $order->shipping_groups;

		$shipping_groups = array();

		$warehouse = new stdClass();
		$warehouse->name = '';
		$warehouse->products = array();
		$warehouse->shippings = array();

		$shipping_groups[0] = $warehouse;

		foreach($order->products as &$product) {
			if($product->cart_product_quantity <= 0)
				continue;

			if(!empty($product->product_warehouse)) {
				if(!isset($shipping_groups[$product->product_warehouse])) {
					$w = new stdClass();
					$w->name = '';
					$w->products = array();
					$w->shippings = array();

					$shipping_groups[$product->product_warehouse] = $w;
				}
				$shipping_groups[$product->product_warehouse]->products[] =& $product;
			} else
				$shipping_groups[0]->products[] =& $product;
		}