diff --git a/config/routes.yaml b/config/routes.yaml
index 7cb4a976..f06a8346 100644
--- a/config/routes.yaml
+++ b/config/routes.yaml
@@ -7,7 +7,10 @@ home:
 
 homeLocale:
     path: /{_locale}
+    requirements:
+        _locale: '%app_locales%'
     defaults:
         _controller: Symfony\Bundle\FrameworkBundle\Controller\RedirectController::redirectAction
+        _locale: '%locale%'
         route: homepage
         permanent: true
diff --git a/src/EventSubscriber/DashboardSubscriber.php b/src/EventSubscriber/DashboardSubscriber.php
index 53343b15..c2a6232f 100644
--- a/src/EventSubscriber/DashboardSubscriber.php
+++ b/src/EventSubscriber/DashboardSubscriber.php
@@ -73,7 +73,7 @@ class DashboardSubscriber implements EventSubscriberInterface
     public static function getSubscribedEvents(): array
     {
         return [
-            DashboardEvent::DASHBOARD => ['onDashboardEvent', 100],
+            DashboardEvent::class => ['onDashboardEvent', 100],
         ];
     }
 
diff --git a/src/EventSubscriber/MenuBuilderSubscriber.php b/src/EventSubscriber/MenuBuilderSubscriber.php
index 567d2cba..2a1c009d 100644
--- a/src/EventSubscriber/MenuBuilderSubscriber.php
+++ b/src/EventSubscriber/MenuBuilderSubscriber.php
@@ -71,7 +71,10 @@ class MenuBuilderSubscriber implements EventSubscriberInterface
             new MenuItemModel('system', 'menu.system', '')
         );
 
-        $this->eventDispatcher->dispatch($menuEvent);
+        // error pages don't have a user and will fail when is_granted() is called
+        if (null !== $event->getRequest()->getUser()) {
+            $this->eventDispatcher->dispatch($menuEvent);
+        }
 
         if ($menuEvent->getAdminMenu()->hasChildren()) {
             $event->addItem(new MenuItemModel('admin', 'menu.admin', ''));
diff --git a/src/EventSubscriber/MenuSubscriber.php b/src/EventSubscriber/MenuSubscriber.php
index b02b48ea..d656596b 100644
--- a/src/EventSubscriber/MenuSubscriber.php
+++ b/src/EventSubscriber/MenuSubscriber.php
@@ -42,7 +42,7 @@ final class MenuSubscriber implements EventSubscriberInterface
     public static function getSubscribedEvents(): array
     {
         return [
-            ConfigureMainMenuEvent::CONFIGURE => ['onMainMenuConfigure', 100],
+            ConfigureMainMenuEvent::class => ['onMainMenuConfigure', 100],
         ];
     }
 
diff --git a/src/EventSubscriber/UserPreferenceSubscriber.php b/src/EventSubscriber/UserPreferenceSubscriber.php
index 258ea1a5..7e7e0aa5 100644
--- a/src/EventSubscriber/UserPreferenceSubscriber.php
+++ b/src/EventSubscriber/UserPreferenceSubscriber.php
@@ -57,7 +57,7 @@ class UserPreferenceSubscriber implements EventSubscriberInterface
     public static function getSubscribedEvents(): array
     {
         return [
-            PrepareUserEvent::PREPARE => ['loadUserPreferences', 200]
+            PrepareUserEvent::class => ['loadUserPreferences', 200]
         ];
     }