diff --git a/bundle/SiteMapBundle/SiteMapGenerator.php b/bundle/SiteMapBundle/SiteMapGenerator.php
index ebe4ecb..e5333db 100644
--- a/bundle/SiteMapBundle/SiteMapGenerator.php
+++ b/bundle/SiteMapBundle/SiteMapGenerator.php
@@ -85,7 +85,7 @@ class SiteMapGenerator implements DataProviderInterface, EventSubscriberInterfac
             return [];
         }
 
-        if ($data['draft']) {
+        if (array_key_exists('draft', $data) && $data['draft']) {
             return [];
         }