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vendor/symfony/routing/Loader/ObjectLoader.php

@@ -33,7 +33,7 @@ abstract class ObjectLoader extends Loader
     /**
      * Calls the object method that will load the routes.
      */
-    public function load(mixed $resource, string $type = null): RouteCollection
+    public function load(mixed $resource, ?string $type = null): RouteCollection
     {
         if (!preg_match('/^[^\:]+(?:::(?:[^\:]+))?$/', $resource)) {
             throw new \InvalidArgumentException(sprintf('Invalid resource "%s" passed to the %s route loader: use the format "object_id::method" or "object_id" if your object class has an "__invoke" method.', $resource, \is_string($type) ? '"'.$type.'"' : 'object'));