diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ed98af11..d75fba633 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 Changelog
 =========
+## 2.5.1
+* Bugfix: Prevent error in `EntityUserProvider::refreshUser` when `$userId` is a `Ulid`
+
 ## 2.5.0 (2026-02-19)
 * Added: PHP 8.5 test coverage,
 * Added: Support for Symfony 8.0,
diff --git a/src/Security/Core/User/EntityUserProvider.php b/src/Security/Core/User/EntityUserProvider.php
index 2b1bc52bc..d2a608014 100644
--- a/src/Security/Core/User/EntityUserProvider.php
+++ b/src/Security/Core/User/EntityUserProvider.php
@@ -94,7 +94,7 @@ public function refreshUser(UserInterface $user): UserInterface
         $username = $user->getUserIdentifier();
 
         if (null === $user = $this->findUser([$identifier => $userId])) {
-            throw $this->createUserNotFoundException($username, \sprintf('User with ID "%d" could not be reloaded.', $userId));
+            throw $this->createUserNotFoundException($username, \sprintf('User with ID "%s" could not be reloaded.', $userId));
         }
 
         return $user;
diff --git a/tests/Fixtures/StringIDUser.php b/tests/Fixtures/StringIDUser.php
new file mode 100644
index 000000000..3875c1dc9
--- /dev/null
+++ b/tests/Fixtures/StringIDUser.php
@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of the HWIOAuthBundle package.
+ *
+ * (c) Hardware Info <opensource@hardware.info>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace HWI\Bundle\OAuthBundle\Tests\Fixtures;
+
+use Deprecated;
+use Symfony\Component\Security\Core\User\UserInterface;
+
+final class StringIDUser implements UserInterface
+{
+    public function getId(): string
+    {
+        return '6f5f78b2-005d-4eea-96c4-79044aaebb34';
+    }
+
+    public function getRoles(): array
+    {
+        return [];
+    }
+
+    public function getUserIdentifier(): string
+    {
+        return 'abc';
+    }
+
+    #[Deprecated]
+    public function eraseCredentials(): void
+    {
+    }
+}
diff --git a/tests/Security/Core/User/EntityUserProviderTest.php b/tests/Security/Core/User/EntityUserProviderTest.php
index 0a42dfb50..87e63fe66 100644
--- a/tests/Security/Core/User/EntityUserProviderTest.php
+++ b/tests/Security/Core/User/EntityUserProviderTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /*
  * This file is part of the HWIOAuthBundle package.
  *
@@ -15,9 +17,11 @@
 use Doctrine\Persistence\ManagerRegistry;
 use Doctrine\Persistence\ObjectManager;
 use Doctrine\Persistence\ObjectRepository;
+use ErrorException;
 use HWI\Bundle\OAuthBundle\OAuth\ResourceOwnerInterface;
 use HWI\Bundle\OAuthBundle\OAuth\Response\UserResponseInterface;
 use HWI\Bundle\OAuthBundle\Security\Core\User\EntityUserProvider;
+use HWI\Bundle\OAuthBundle\Tests\Fixtures\StringIDUser;
 use HWI\Bundle\OAuthBundle\Tests\Fixtures\User;
 use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\Attributes\IgnoreDeprecations;
@@ -184,4 +188,33 @@ private function assertUserNotFoundException(): void
     {
         $this->expectException(UserNotFoundException::class);
     }
+
+    public function testRefreshUserWorksWithUlid(): void
+    {
+        // Simulate `framework.php_errors.throw: true`
+        set_error_handler(static function (
+            int $severity,
+            string $message,
+            string $file,
+            int $line
+        ): never {
+            throw new ErrorException($message, 0, $severity, $file, $line);
+        });
+
+        try {
+            $this->assertUserNotFoundException();
+            $this->expectExceptionMessage('User with ID "6f5f78b2-005d-4eea-96c4-79044aaebb34" could not be reloaded.');
+
+            $provider = new EntityUserProvider(
+                $this->createManagerRegistryMock(),
+                StringIDUser::class,
+                []
+            );
+
+            $provider->refreshUser(new StringIDUser());
+        } finally {
+            restore_error_handler();
+        }
+    }
+
 }