diff --git a/vendor/magento/module-backend/Model/Widget/Grid/Row/UrlGeneratorFactory.php b/vendor/magento/module-backend/Model/Widget/Grid/Row/UrlGeneratorFactory.php
index c4d96e0cdc7dc..e0cd390a01c2f 100644
--- a/vendor/magento/module-backend/Model/Widget/Grid/Row/UrlGeneratorFactory.php
+++ b/vendor/magento/module-backend/Model/Widget/Grid/Row/UrlGeneratorFactory.php
@@ -36,11 +36,11 @@ public function __construct(\Magento\Framework\ObjectManagerInterface $objectMan
      */
     public function createUrlGenerator($generatorClassName, array $arguments = [])
     {
-        $rowUrlGenerator = $this->_objectManager->create($generatorClassName, $arguments);
-        if (false === $rowUrlGenerator instanceof \Magento\Backend\Model\Widget\Grid\Row\GeneratorInterface) {
+        // Validate the type BEFORE instantiation.
+        if (!is_a($generatorClassName, \Magento\Backend\Model\Widget\Grid\Row\GeneratorInterface::class, true)) {
             throw new \InvalidArgumentException('Passed wrong parameters');
         }
 
-        return $rowUrlGenerator;
+        return $this->_objectManager->create($generatorClassName, $arguments);
     }
 }