diff --git a/beike/Shop/Http/Controllers/CartController.php b/beike/Shop/Http/Controllers/CartController.php
index 00e1160b..a976f2bc 100644
--- a/beike/Shop/Http/Controllers/CartController.php
+++ b/beike/Shop/Http/Controllers/CartController.php
@@ -18,7 +18,7 @@ class CartController extends Controller
             ->whereRelation('product', 'active', '=', true)
             ->findOrFail($skuId);
 
-        $cart = CartService::add($customer, $sku, $quantity);
+        $cart = CartService::add($sku, $quantity, $customer);
 
         return $cart;
     }
diff --git a/beike/Shop/Services/CartService.php b/beike/Shop/Services/CartService.php
index d9e79aa3..8e610a6f 100644
--- a/beike/Shop/Services/CartService.php
+++ b/beike/Shop/Services/CartService.php
@@ -28,12 +28,15 @@ class CartService
     }
 
 
-    public static function add(Customer $customer, ProductSku $sku, int $quantity)
+    public static function add($sku, int $quantity, $customer = null)
     {
-        $customerId = $customer->id;
+        $customerId = $customer->id ?? 0;
         $productId = $sku->product_id;
         $skuId = $sku->id;
 
+        if (empty($sku)) {
+            throw new \Exception("无效的SKU ID");
+        }
         $cart = Cart::query()
             ->where('customer_id', $customerId)
             ->where('product_id', $productId)