diff --git a/src/Page/Page.php b/src/Page/Page.php
index 04da2b1..57ae1db 100644
--- a/src/Page/Page.php
+++ b/src/Page/Page.php
@@ -92,7 +92,7 @@ protected function verifyUrl(array $urlParameters = []): void
         }
     }
 
-    protected function getParameter(string $name): NodeElement
+    protected function getParameter(string $name): ?string
     {
         return $this->parameters[$name] ?? null;
     }