diff --git a/src/Controller/KiCADAPIController.php b/src/Controller/KiCADAPIController.php
index 01c79032..17be45ea 100644
--- a/src/Controller/KiCADAPIController.php
+++ b/src/Controller/KiCADAPIController.php
@@ -36,17 +36,16 @@ use Symfony\Component\Routing\Annotation\Route;
 class KiCADAPIController extends AbstractController
 {
     public function __construct(
-        private readonly EntityManagerInterface $em,
         private readonly KiCADHelper $kiCADHelper,
-
     )
     {
-
     }
 
     #[Route('/', name: 'kicad_api_root')]
     public function root(): Response
     {
+        $this->denyAccessUnlessGranted('HAS_ACCESS_PERMISSIONS');
+
         //The API documentation says this can be either blank or the URL to the endpoints
         return $this->json([
             'categories' => '',
diff --git a/src/Form/Part/EDA/KicadFieldAutocompleteType.php b/src/Form/Part/EDA/KicadFieldAutocompleteType.php
index f1960559..9545114a 100644
--- a/src/Form/Part/EDA/KicadFieldAutocompleteType.php
+++ b/src/Form/Part/EDA/KicadFieldAutocompleteType.php
@@ -48,6 +48,7 @@ class KicadFieldAutocompleteType extends AbstractType
             'file' => fn(Options $options) => match ($options['type']) {
                 self::TYPE_FOOTPRINT => self::FOOTPRINT_PATH,
                 self::TYPE_SYMBOL => self::SYMBOL_PATH,
+                default => throw new \InvalidArgumentException('Invalid type'),
             }
         ]);
     }
diff --git a/src/Services/Cache/ElementCacheTagGenerator.php b/src/Services/Cache/ElementCacheTagGenerator.php
index 7873ba1b..382c9317 100644
--- a/src/Services/Cache/ElementCacheTagGenerator.php
+++ b/src/Services/Cache/ElementCacheTagGenerator.php
@@ -59,7 +59,7 @@ class ElementCacheTagGenerator
         }
 
         //If the element is a proxy, then get the real class name of the underlying object
-        if ($element instanceof Proxy || str_starts_with($element, 'Proxies\\')) {
+        if (is_a($element, Proxy::class, true) || str_starts_with($element, 'Proxies\\')) {
             $element = get_parent_class($element);
         }