diff --git a/core/lib/Drupal/Core/Controller/ControllerResolver.php b/core/lib/Drupal/Core/Controller/ControllerResolver.php
index 7d39389..9d25bfb 100644
--- a/core/lib/Drupal/Core/Controller/ControllerResolver.php
+++ b/core/lib/Drupal/Core/Controller/ControllerResolver.php
@@ -107,7 +107,7 @@ protected function doGetArguments(Request $request, $controller, array $paramete
     if ($request->attributes->has('_raw') && $raw = $request->attributes->get('_raw')->all()) {
       foreach ($parameters as $parameter) {
         // Use the raw value if a parameter has no typehint.
-        if (!$parameter->getClass()) {
+        if (!$parameter->getClass() && isset($raw[$parameter->name])) {
           $position = $parameter->getPosition();
           $arguments[$position] = $raw[$parameter->name];
         }