diff --git a/core/lib/Drupal/Core/EventSubscriber/EntityRouteAlterSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/EntityRouteAlterSubscriber.php
index 9a87857..53f9e31 100644
--- a/core/lib/Drupal/Core/EventSubscriber/EntityRouteAlterSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/EntityRouteAlterSubscriber.php
@@ -62,7 +62,7 @@ public function onRoutingRouteAlterSetType(RouteBuildEvent $event) {
           'type' => 'entity:' . $parameter_name,
         );
       }
-      if ($parameter_definitions) {
+      if (!empty($parameter_definitions)) {
         $route->setOption('parameters', $parameter_definitions);
       }
     }
diff --git a/core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php b/core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php
index c829304..0b494d8 100644
--- a/core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php
+++ b/core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php
@@ -103,7 +103,7 @@ public function getConverter($converter) {
   }
 
   /**
-   * For each route, saves a list of applicable converters to the route.
+   * Saves a list of applicable converters to each route.
    *
    * @param \Symfony\Component\Routing\RouteCollection $routes
    *   A collection of routes to apply converters to.