Index: /controller/wpsg_AdminController.class.php
===================================================================
--- /controller/wpsg_AdminController.class.php	(revision 7454)
+++ /controller/wpsg_AdminController.class.php	(revision 7455)
@@ -1701,5 +1701,5 @@
 			{
 
-				$this->update_option('wpsg_htmlmail', $_REQUEST['wpsg_htmlmail'], false, false, "key");
+			    $this->update_option('wpsg_htmlmail', $_REQUEST['wpsg_htmlmail'], false, false, WPSG_SANITIZE_CHECKBOX);
 
 				wpsg_saveEMailConfig("global"); // Global