Issue #3387229 Check if also an EntityInterface so only entities are included.

src/EventSubscriber/LanguageRedirectionSubscriber.php

@@ -2,6 +2,7 @@
 
 namespace Drupal\language_switcher_browser\EventSubscriber;
 
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Language\LanguageManagerInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\Routing\TrustedRedirectResponse;
@@ -101,7 +102,8 @@ class LanguageRedirectionSubscriber implements EventSubscriberInterface {
         $entity = $this->routeMatch->getParameter('node');
 
         // Check if the entity has translations.
-        if ($entity && $entity->getEntityTypeId() === 'node' &&  $entity->hasTranslation($preferred_language)) {
+        if ($entity && $entity instanceof EntityInterface && $entity->getEntityTypeId() === 'node' &&  $entity->hasTranslation($preferred_language)) {
+
           // Get the translated node.
           $translated_node = $entity->getTranslation($preferred_language);