Fixed checkout for null sku https://gitee.com/beikeshop/beikeshop/issues/I7D59N?from=project-issue

beike/Models/ProductSku.php

@@ -34,6 +34,11 @@ class ProductSku extends Base
         $product      = $this->product;
         $localeCode   = locale();
         $variantLabel = '';
+
+        if(empty($product->variables)) {
+            return '';
+        }
+
         foreach ($product->variables as $index => $variable) {
             $valueIndex   = $this->variants[$index];
             $variantName  = $variable['name'][$localeCode]                        ?? '';

beike/Shop/Services/CartService.php

@@ -44,6 +44,7 @@ class CartService
             $product     = $item->product                   ?? null;
             if (empty($description) || empty($product)) {
                 $item->delete();
+                return false;
             }
 
             $cartQuantity = $item->quantity;