diff --git a/app/code/Magento/Catalog/Ui/Component/Listing/Columns/Thumbnail.php b/app/code/Magento/Catalog/Ui/Component/Listing/Columns/Thumbnail.php
index 020f00bc78f76..bdd2e04041028 100644
--- a/app/code/Magento/Catalog/Ui/Component/Listing/Columns/Thumbnail.php
+++ b/app/code/Magento/Catalog/Ui/Component/Listing/Columns/Thumbnail.php
@@ -91,6 +91,6 @@ protected function getAlt($row)
             return null;
         }
         // phpcs:disable Magento2.Functions.DiscouragedFunction
-        return html_entity_decode($row[$altField], ENT_QUOTES, "UTF-8") ?? null;
+        return html_entity_decode((string) $row[$altField], ENT_QUOTES, "UTF-8") ?? null;
     }
 }