diff --git a/alkatorapi/views.py b/alkatorapi/views.py
index 68d491f..6649ed6 100644
--- a/alkatorapi/views.py
+++ b/alkatorapi/views.py
@@ -411,7 +411,7 @@ def cart_buy(request):
     total_price = 0
     invoice.save()
 
-    for cp in itertools.chain(cart_products, [Product.objects.get(id=2)]):
+    for cp in itertools.chain(cart_products, [CartProduct(quantity=1, product=Product.objects.get(id=2), cart=cart)]):
         ip = InvoiceProduct(
             invoice=invoice,
             price=cp.product.price,