diff --git a/src/EventListener/LocaleEventListener.php b/src/EventListener/LocaleEventListener.php
index 0ee9c003..cd7e4700 100644
--- a/src/EventListener/LocaleEventListener.php
+++ b/src/EventListener/LocaleEventListener.php
@@ -56,8 +56,8 @@ public function onImplicitLogin(UserEvent $event): void
             return;
         }
 
-        $this->setLocale($event->getRequest(), $user);
-        $this->setTimezone($event->getRequest(), $user);
+        $this->setLocale($event->getRequest(), $user->getLocale());
+        $this->setTimezone($event->getRequest(), $user->getTimezone());
     }
 
     public function onSecurityInteractiveLogin(InteractiveLoginEvent $event): void
@@ -68,8 +68,8 @@ public function onSecurityInteractiveLogin(InteractiveLoginEvent $event): void
             return;
         }
 
-        $this->setLocale($event->getRequest(), $user);
-        $this->setTimezone($event->getRequest(), $user);
+        $this->setLocale($event->getRequest(), $user->getLocale());
+        $this->setTimezone($event->getRequest(), $user->getTimezone());
     }
 
     public function onKernelRequest(RequestEvent $event): void
@@ -92,7 +92,7 @@ public function onTimezoneChanged(UserEvent $event): void
         $user = $event->getUser();
 
         if ($user instanceof LocaleAwareUser && null !== $event->getRequest()) {
-            $this->setTimezone($event->getRequest(), $user);
+            $this->setTimezone($event->getRequest(), $user->getTimezone());
         }
     }
 
@@ -101,11 +101,11 @@ public function onLocaleChanged(UserEvent $event): void
         $user = $event->getUser();
 
         if ($user instanceof LocaleAwareUser && null !== $event->getRequest()) {
-            $this->setLocale($event->getRequest(), $user);
+            $this->setLocale($event->getRequest(), $user->getLocale());
         }
     }
 
-    private function setLocale(Request $request, LocaleAwareUser $user): void
+    private function setLocale(Request $request, ?string $locale): void
     {
         if (!$request->hasSession()) {
             return;
@@ -113,8 +113,6 @@ private function setLocale(Request $request, LocaleAwareUser $user): void
 
         $session = $request->getSession();
 
-        $locale = $user->getLocale();
-
         if ('' === $locale || null === $locale) {
             $session->remove(self::ATTR_LOCALE);
 
@@ -126,7 +124,7 @@ private function setLocale(Request $request, LocaleAwareUser $user): void
         $session->set(self::ATTR_LOCALE, $locale);
     }
 
-    private function setTimezone(Request $request, LocaleAwareUser $user): void
+    private function setTimezone(Request $request, ?string $timezone): void
     {
         if (!$request->hasSession()) {
             return;
@@ -134,8 +132,6 @@ private function setTimezone(Request $request, LocaleAwareUser $user): void
 
         $session = $request->getSession();
 
-        $timezone = $user->getTimezone();
-
         if ('' === $timezone || null === $timezone) {
             $session->remove(self::ATTR_TIMEZONE);
 
diff --git a/tests/EventListener/LocaleEventListenerTest.php b/tests/EventListener/LocaleEventListenerTest.php
new file mode 100644
index 00000000..16a40d57
--- /dev/null
+++ b/tests/EventListener/LocaleEventListenerTest.php
@@ -0,0 +1,178 @@
+<?php
+
+/*
+ * This file is part of the NucleosUserBundle package.
+ *
+ * (c) Christian Gripp <mail@core23.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Nucleos\UserBundle\Tests\EventListener;
+
+use Nucleos\UserBundle\Event\UserEvent;
+use Nucleos\UserBundle\EventListener\LocaleEventListener;
+use Nucleos\UserBundle\NucleosUserEvents;
+use Nucleos\UserBundle\Tests\App\Entity\TestUser;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Test\TestBrowserToken;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Session\Session;
+use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\HttpKernel\KernelInterface;
+use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
+use Symfony\Component\Security\Http\SecurityEvents;
+use Symfony\Contracts\Translation\LocaleAwareInterface as LocaleAwareTranslator;
+
+final class LocaleEventListenerTest extends TestCase
+{
+    /**
+     * @var LocaleAwareTranslator&MockObject
+     */
+    private LocaleAwareTranslator $translator;
+
+    private LocaleEventListener $listener;
+
+    protected function setUp(): void
+    {
+        $this->translator = $this->createMock(LocaleAwareTranslator::class);
+        $this->listener   = new LocaleEventListener($this->translator);
+    }
+
+    #[Test]
+    public function getSubscribedEvents(): void
+    {
+        self::assertSame([
+            NucleosUserEvents::SECURITY_IMPLICIT_LOGIN => 'onImplicitLogin',
+            SecurityEvents::INTERACTIVE_LOGIN          => 'onSecurityInteractiveLogin',
+            KernelEvents::REQUEST                      => [['onKernelRequest', 20]],
+            NucleosUserEvents::USER_LOCALE_CHANGED     => 'onLocaleChanged',
+            NucleosUserEvents::USER_TIMEZONE_CHANGED   => 'onTimezoneChanged',
+        ], LocaleEventListener::getSubscribedEvents());
+    }
+
+    #[Test]
+    public function onImplicitLogin(): void
+    {
+        $session = new Session(new MockArraySessionStorage());
+
+        $request = new Request();
+        $request->setSession($session);
+
+        $user = new TestUser();
+        $user->setLocale('fr');
+        $user->setTimezone('Europe/Paris');
+
+        $event = new UserEvent($user, $request);
+
+        $this->translator->expects(self::once())
+            ->method('setLocale')
+            ->with('fr')
+        ;
+
+        $this->listener->onImplicitLogin($event);
+
+        self::assertSame('fr', $request->getLocale());
+        self::assertSame('fr', $session->get('_locale'));
+        self::assertSame('Europe/Paris', $session->get('_timezone'));
+    }
+
+    #[Test]
+    public function onSecurityInteractiveLogin(): void
+    {
+        $session = new Session(new MockArraySessionStorage());
+
+        $request = new Request();
+        $request->setSession($session);
+
+        $user = new TestUser();
+        $user->setLocale('fr');
+        $user->setTimezone('Europe/Paris');
+
+        $event = new InteractiveLoginEvent($request, new TestBrowserToken(user: $user));
+
+        $this->translator->expects(self::once())
+            ->method('setLocale')
+            ->with('fr')
+        ;
+
+        $this->listener->onSecurityInteractiveLogin($event);
+
+        self::assertSame('fr', $request->getLocale());
+        self::assertSame('fr', $session->get('_locale'));
+        self::assertSame('Europe/Paris', $session->get('_timezone'));
+    }
+
+    #[Test]
+    public function onKernelRequest(): void
+    {
+        $session = new Session(new MockArraySessionStorage());
+        $session->set('_locale', 'fr');
+        $session->set('_timezone', 'Europe/Paris');
+
+        $request = new Request();
+        $request->setSession($session);
+        $request->cookies->set($session->getName(), $session->getId());
+
+        $event = new RequestEvent($this->createMock(KernelInterface::class), $request, HttpKernelInterface::MAIN_REQUEST);
+
+        $this->translator->expects(self::once())
+            ->method('setLocale')
+            ->with('fr')
+        ;
+
+        $this->listener->onKernelRequest($event);
+
+        self::assertSame('fr', $request->getLocale());
+        self::assertSame('fr', $session->get('_locale'));
+        self::assertSame('Europe/Paris', $session->get('_timezone'));
+    }
+
+    #[Test]
+    public function onTimezoneChanged(): void
+    {
+        $session = new Session(new MockArraySessionStorage());
+
+        $request = new Request();
+        $request->setSession($session);
+
+        $user = new TestUser();
+        $user->setTimezone('Europe/Paris');
+
+        $event = new UserEvent($user, $request);
+
+        $this->listener->onTimezoneChanged($event);
+
+        self::assertSame('Europe/Paris', $session->get('_timezone'));
+    }
+
+    #[Test]
+    public function onLocaleChanged(): void
+    {
+        $session = new Session(new MockArraySessionStorage());
+
+        $request = new Request();
+        $request->setSession($session);
+
+        $user = new TestUser();
+        $user->setLocale('de');
+
+        $event = new UserEvent($user, $request);
+
+        $this->translator->expects(self::once())
+            ->method('setLocale')
+            ->with('de')
+        ;
+
+        $this->listener->onLocaleChanged($event);
+
+        self::assertSame('de', $request->getLocale());
+        self::assertSame('de', $session->get('_locale'));
+    }
+}