fix: accept string argument

src/Twig/AppRuntime.php

@@ -50,13 +50,13 @@ class AppRuntime implements RuntimeExtensionInterface
         return 'nationality' === $property ? $country->getNationality() : $country->getName();
     }
 
-    public function bpnPickupLabel(?int $id): ?string
+    public function bpnPickupLabel($id): ?string
     {
         if (null === $id) {
             return 'keine Busbegleitung';
         }
 
-        $pickup = $this->pickups->get($id);
+        $pickup = $this->pickups->get((int) $id);
 
         if (null === $pickup) {
             return null;