Fix for this error:

Fatal error: Call to a member function createElement() on a non-object in /var/www/kohana/modules/sitemap/classes/kohana/sitemap/video.php on line 293

classes/kohana/sitemap/video.php

@@ -279,7 +279,7 @@ public function create()
 		/**
 		 * Small recursive function to add attributes to the document.
 		 */
-		$append_attributes = function($attributes) use ($video)
+		$append_attributes = function($attributes) use ($video, $document)
 		{
 			foreach($attributes as $name => $value)
 			{