diff --git a/Classes/Fusion/XmlSitemapUrlsImplementation.php b/Classes/Fusion/XmlSitemapUrlsImplementation.php
index 4dfc061..57170cf 100644
--- a/Classes/Fusion/XmlSitemapUrlsImplementation.php
+++ b/Classes/Fusion/XmlSitemapUrlsImplementation.php
@@ -158,7 +158,7 @@ protected function collectItems(array &$items, Subtree $subtree): void
         if ($this->isDocumentNodeToBeIndexed($node)) {
             $item = [
                 'node' => $node,
-                'lastModificationDateTime' => $node->timestamps->lastModified,
+                'lastModificationDateTime' => $node->timestamps->lastModified ?: $node->timestamps->created,
                 'priority' => $node->getProperty('xmlSitemapPriority') ?: '',
                 'images' => [],
             ];