diff --git a/src/Documents/Export/YamlExportPage.php b/src/Documents/Export/YamlExportPage.php
index 1361f14..8fb7652 100644
--- a/src/Documents/Export/YamlExportPage.php
+++ b/src/Documents/Export/YamlExportPage.php
@@ -11,7 +11,7 @@ class YamlExportPage
     public string $path;
     public string $language;
     public string $navigation_name;
-    public string $navigation_title;
+    public ?string $navigation_title = null;
     public string $key;
     public string $title;
     public string $controller;