diff --git a/phpstan.neon b/phpstan.neon
index db118378..95eee3c0 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -19,6 +19,10 @@ parameters:
     symfony:
         container_xml_path: '%rootDir%/../../../var/cache/dev/App_KernelDevDebugContainer.xml'
 
+    doctrine:
+    	objectManagerLoader: tests/object-manager.php
+    	allowNullablePropertyForRequiredField: true
+
     checkUninitializedProperties: true
 
     checkFunctionNameCase: true
@@ -48,8 +52,11 @@ parameters:
     ignoreErrors:
         # Ignore errors caused by complex mapping with AbstractStructuralDBElement
         - '#AbstractStructuralDBElement does not have a field named \$parent#'
-        - '#AbstractStructuralDBElement does not have a field named \$name#'
+        #- '#AbstractStructuralDBElement does not have a field named \$name#'
 
         # Ignore errors related to the use of the ParametersTrait in Part entity
         - '#expects .*PartParameter, .*AbstractParameter given.#'
-        - '#Part::getParameters\(\) should return .*AbstractParameter#'
\ No newline at end of file
+        - '#Part::getParameters\(\) should return .*AbstractParameter#'
+
+        # Ignore doctrine type mapping mismatch
+        - '#Property .* type mapping mismatch: property can contain .* but database expects .*#'
\ No newline at end of file
diff --git a/src/Controller/UserSettingsController.php b/src/Controller/UserSettingsController.php
index c0d9f66d..a70efbff 100644
--- a/src/Controller/UserSettingsController.php
+++ b/src/Controller/UserSettingsController.php
@@ -411,6 +411,9 @@ class UserSettingsController extends AbstractController
         $this->denyAccessUnlessGranted('IS_AUTHENTICATED_FULLY');
 
         $token = new ApiToken();
+        if (!$this->getUser() instanceof User) {
+            throw new RuntimeException('This controller only works only for Part-DB User objects!');
+        }
         $token->setUser($this->getUser());
 
         $secret = null;
diff --git a/src/Entity/Attachments/MeasurementUnitAttachment.php b/src/Entity/Attachments/MeasurementUnitAttachment.php
index 58467f86..7b7c4f83 100644
--- a/src/Entity/Attachments/MeasurementUnitAttachment.php
+++ b/src/Entity/Attachments/MeasurementUnitAttachment.php
@@ -36,9 +36,8 @@ use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 class MeasurementUnitAttachment extends Attachment
 {
     final public const ALLOWED_ELEMENT_CLASS = MeasurementUnit::class;
-    /**
-     * @var Manufacturer|null the element this attachment is associated with
-     */
+
+
     #[ORM\ManyToOne(targetEntity: MeasurementUnit::class, inversedBy: 'attachments')]
     #[ORM\JoinColumn(name: 'element_id', nullable: false, onDelete: 'CASCADE')]
     protected ?AttachmentContainingDBElement $element = null;
diff --git a/src/Security/ApiTokenAuthenticator.php b/src/Security/ApiTokenAuthenticator.php
index 6d3dc09c..d274ca1a 100644
--- a/src/Security/ApiTokenAuthenticator.php
+++ b/src/Security/ApiTokenAuthenticator.php
@@ -118,12 +118,8 @@ class ApiTokenAuthenticator implements AuthenticatorInterface
 
     public function onAuthenticationFailure(Request $request, AuthenticationException $exception): Response
     {
-        if (null !== $this->translator) {
-            $errorMessage = $this->translator->trans($exception->getMessageKey(), $exception->getMessageData(),
-                'security');
-        } else {
-            $errorMessage = strtr($exception->getMessageKey(), $exception->getMessageData());
-        }
+        $errorMessage = $this->translator->trans($exception->getMessageKey(), $exception->getMessageData(),
+            'security');
 
         return new Response(
             null,
@@ -152,8 +148,9 @@ class ApiTokenAuthenticator implements AuthenticatorInterface
 
         return sprintf('Bearer %s', implode(',', $values));
     }
-public function onAuthenticationSuccess(Request $request, TokenInterface $token, string $firewallName): ?Response
-{
-    return null;
-}
+
+    public function onAuthenticationSuccess(Request $request, TokenInterface $token, string $firewallName): ?Response
+    {
+        return null;
+    }
 }
\ No newline at end of file
diff --git a/tests/object-manager.php b/tests/object-manager.php
new file mode 100644
index 00000000..1e335268
--- /dev/null
+++ b/tests/object-manager.php
@@ -0,0 +1,32 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2023 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+use App\Kernel;
+use Symfony\Component\Dotenv\Dotenv;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+(new Dotenv())->bootEnv(__DIR__ . '/../.env');
+
+$kernel = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG']);
+$kernel->boot();
+return $kernel->getContainer()->get('doctrine')->getManager();
\ No newline at end of file