diff --git a/composer.json b/composer.json
index 90adaaf..f9b0d70 100644
--- a/composer.json
+++ b/composer.json
@@ -16,6 +16,7 @@
     ],
     "require": {
         "php": ">=8.2",
+        "ext-apcu": "*",
         "php-di/php-di": "^7.0.1",
         "nikic/fast-route": "^1.3",
         "symfony/http-foundation": "^6.2.5",
diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index 097553a..f4f4b6f 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -5,4 +5,9 @@
       <code>require_once (string) $file</code>
     </UnresolvableInclude>
   </file>
+  <file src="src/Infrastructure/functions.php">
+    <MixedArgumentTypeCoercion>
+      <code>$callable</code>
+    </MixedArgumentTypeCoercion>
+  </file>
 </files>
diff --git a/psalm.xml b/psalm.xml
index 80e8554..8be119a 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -1,11 +1,11 @@
 <?xml version="1.0"?>
 <psalm
-    errorLevel="2"
-    resolveFromConfigFile="true"
+    errorLevel="1"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="https://getpsalm.org/schema/config"
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
     findUnusedBaselineEntry="true"
+    findUnusedCode="false"
     errorBaseline="psalm-baseline.xml"
 >
     <projectFiles>
diff --git a/src/Infrastructure/WebApp/Route/HandlerResolver.php b/src/Infrastructure/WebApp/Route/HandlerResolver.php
index 7df5c40..80b9a72 100644
--- a/src/Infrastructure/WebApp/Route/HandlerResolver.php
+++ b/src/Infrastructure/WebApp/Route/HandlerResolver.php
@@ -46,8 +46,7 @@ final readonly class HandlerResolver
         );
 
         if ($routeInfo[0] === \FastRoute\Dispatcher::NOT_FOUND) {
-            $event->response = new Response('Not Found', 404);
-            $event->stopped = true;
+            $this->notFound($event);
             return;
         }
 
@@ -57,12 +56,34 @@ final readonly class HandlerResolver
             return;
         }
 
+        if (
+            !is_array($routeInfo[1])
+            || count($routeInfo[1]) !== 2
+            || !is_string($routeInfo[1][0])
+            || $routeInfo[1][0] === ''
+            || !is_string($routeInfo[1][1])
+            || $routeInfo[1][1] === ''
+        ) {
+            $this->notFound($event);
+            return;
+        }
+
         $event->handler = new Handler(
             HttpMethod::from($event->request->getMethod()),
             $event->request->getPathInfo(),
-            ...$routeInfo[1],
+            $routeInfo[1][0],
+            $routeInfo[1][1],
         );
 
-        $event->request->attributes->add($routeInfo[2]);
+        /** @var array<array-key, mixed> $args */
+        $args = $routeInfo[2];
+
+        $event->request->attributes->add($args);
+    }
+
+    private function notFound(RequestEvent $event): void
+    {
+        $event->response = new Response('Not Found', 404);
+        $event->stopped = true;
     }
 }