fix 38200: Exception is not getting handled properly while adding a product to cart in the compare product page

Author: rogerdz

app/code/Magento/Catalog/Controller/Product/Compare/Index.php

@@ -6,8 +6,8 @@
  */
 namespace Magento\Catalog\Controller\Product\Compare;
 
-use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;
 use Magento\Catalog\Api\ProductRepositoryInterface;
+use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;
 use Magento\Framework\Data\Form\FormKey\Validator;
 use Magento\Framework\View\Result\PageFactory;
 
@@ -81,6 +81,8 @@ public function execute()
             $this->_catalogSession->setBeforeCompareUrl(
                 $this->urlDecoder->decode($beforeUrl)
             );
+        } else {
+            $this->_catalogSession->unsBeforeCompareUrl();
         }
         return $this->resultPageFactory->create();
     }

app/code/Magento/Catalog/CustomerData/CompareProducts.php

@@ -73,7 +73,7 @@ public function getSectionData()
         return [
             'count' => $count,
             'countCaption' => $count == 1 ? __('1 item') : __('%1 items', $count),
-            'listUrl' => $this->helper->getListUrl(),
+            'listUrl' => $this->helper->getListUrl(false),
             'items' => $count ? $this->getItems() : [],
             'websiteId' => $this->storeManager->getWebsite()->getId()
         ];

app/code/Magento/Catalog/Helper/Product/Compare.php

@@ -142,12 +142,13 @@ public function __construct(
     /**
      * Retrieve compare list url
      *
+     * @param bool $encodedUrl
      * @return string
      */
-    public function getListUrl()
+    public function getListUrl($encodedUrl = true)
     {
         $params = [
-            \Magento\Framework\App\ActionInterface::PARAM_NAME_URL_ENCODED => $this->getEncodedUrl()
+            \Magento\Framework\App\ActionInterface::PARAM_NAME_URL_ENCODED => $encodedUrl ? $this->getEncodedUrl() : ''
         ];
         return $this->_getUrl('catalog/product_compare', $params);
     }