diff --git a/_config.php b/_config.php
index 3b05107..85a71c9 100644
--- a/_config.php
+++ b/_config.php
@@ -26,6 +26,6 @@
  * consult the Commenting class.
  */
 
-if(class_exists('SiteTree')) {
+if(class_exists('SiteTree') && !Commenting::has_commenting('SiteTree')) {
 	Commenting::add('SiteTree');
 }
\ No newline at end of file