diff --git a/dictionaries/PropertyMap.php b/dictionaries/PropertyMap.php
index b97344960de..e0f91665df6 100644
--- a/dictionaries/PropertyMap.php
+++ b/dictionaries/PropertyMap.php
@@ -370,7 +370,7 @@
     ],
     'domnode' => [
         'nodeName' => 'string',
-        'nodeValue' => 'string',
+        'nodeValue' => 'string|null',
         'nodeType' => 'int',
         'parentNode' => 'DOMNode|null',
         'childNodes' => 'DomNodeList<DomNode>',