compare-products - Fixed errors on creating comparelist and adding products.

Author: Prabhu Ram

app/code/Magento/CompareListGraphQl/Model/Service/AddToCompareList.php

@@ -62,6 +62,10 @@ public function execute(int $listId, array $products, ContextInterface $context)
     {
         $storeId = (int)$context->getExtensionAttributes()->getStore()->getStoreId();
         $customerId = $context->getUserId();
+        if ($customerId) {
+            $this->itemCollection->setListIdToCustomerCompareItems($listId, $customerId);
+        }
+
         if (count($products)) {
             $existedProducts = $this->itemCollection->getProductsByListId($listId);
             foreach ($products as $productId) {
@@ -80,10 +84,6 @@ public function execute(int $listId, array $products, ContextInterface $context)
             }
         }
 
-        if ($customerId) {
-            $this->itemCollection->setListIdToCustomerCompareItems($listId, $customerId);
-        }
-
         return (int)$listId;
     }