diff --git a/dom/form_params/form_params.js b/dom/form_params/form_params.js
index e3d102cb..0527067e 100644
--- a/dom/form_params/form_params.js
+++ b/dom/form_params/form_params.js
@@ -10,7 +10,7 @@ steal("jquery", function( $ ) {
 				return true;
 			} else if ( value === 'false' ) {
 				return false;
-			} else if ( value === '' ) {
+			} else if ( value === '' || value === null ) {
 				return undefined;
 			}
 			return value;