diff --git a/src/Search/Response/GraphQL/GraphQLResponseParser.php b/src/Search/Response/GraphQL/GraphQLResponseParser.php
index e5e0abcd..1b96e6ad 100644
--- a/src/Search/Response/GraphQL/GraphQLResponseParser.php
+++ b/src/Search/Response/GraphQL/GraphQLResponseParser.php
@@ -66,6 +66,9 @@ public function getProductIds(): array
 
         $productIds = [];
         foreach ($productCustomFields as $customFields) {
+            if (!$customFields) {
+                continue;
+            }
             foreach ($customFields as $customField) {
                 if ($customField->getKey() === Builder::PRODUCT_ID_KEY) {
                     $productIds[$customField->getValue()] = $customField->getValue();