From 3bbaadfea553e9105611619ea113690988180344 Mon Sep 17 00:00:00 2001
From: Patrick <privat@skyraptor.eu>
Date: Sat, 5 Feb 2022 19:15:07 +0100
Subject: [PATCH] Update Cart.php

---
 src/Cart.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Cart.php b/src/Cart.php
index 62b9817..db45319 100644
--- a/src/Cart.php
+++ b/src/Cart.php
@@ -134,7 +134,7 @@ class Cart
         }
         /* Also allow passing a Buyable instance, get data from the instance rather than parameters */
         else if ($id instanceof Buyable) {
-            if (! is_int($nameOrQty)) {
+            if (! is_null($qtyOrOptions) && ! is_int($nameOrQty)) {
                 throw new InvalidArgumentException('$nameOrQty must be of int (quantity) when adding a Buyable instance');
             }