AC-15054: Product Add to Cart issue in Rest API

Author: wip44850

app/code/Magento/Quote/Plugin/UpdateCartId.php

@@ -131,6 +131,9 @@ private function validateWebsiteAssignment(int $productId, int $storeId): void
     {
         try {
             $product = $this->productRepository->getById($productId, false, $storeId);
+            if (empty($product->getWebsiteIds())) {
+                return;
+            }
             $this->checkProductInWebsite($product->getWebsiteIds(), $storeId);
         } catch (NoSuchEntityException) {
             throw new LocalizedException(__('Product that you are trying to add is not available.'));

app/code/Magento/Quote/Plugin/Webapi/ValidateProductWebsiteAssignment.php

@@ -97,6 +97,9 @@ private function checkProductWebsiteAssignment($productId, $storeId): void
     {
         try {
             $product = $this->productRepository->getById($productId, false, $storeId);
+            if (empty($product->getWebsiteIds())) {
+                return;
+            }
             $this->validateWebsiteAssignment($product->getWebsiteIds(), $storeId);
         } catch (NoSuchEntityException $e) {
             throw new LocalizedException(__('Product that you are trying to add is not available.'));
@@ -113,7 +116,6 @@ private function checkProductWebsiteAssignment($productId, $storeId): void
     private function validateWebsiteAssignment(?array $websiteIds, int $storeId): void
     {
         $websiteId = $this->storeManager->getStore($storeId)->getWebsiteId();
-
         if (empty($websiteIds) || !in_array($websiteId, $websiteIds, true)) {
             throw new LocalizedException(__('Product that you are trying to add is not available.'));
         }