diff --git a/src/Model/Resolver/Wishlist/CreatorResolver.php b/src/Model/Resolver/Wishlist/CreatorResolver.php
index c896d4b..828149d 100644
--- a/src/Model/Resolver/Wishlist/CreatorResolver.php
+++ b/src/Model/Resolver/Wishlist/CreatorResolver.php
@@ -52,6 +52,11 @@ public function resolve(
         }
 
         $customerId = $wishlist->getCustomerId();
+
+        if (!$customerId) {
+            return null;
+        }
+
         /** @var CustomerInterface $customer */
         $customer = $this->customerRepository->getById($customerId);