diff --git a/lib/client/ie.js b/lib/client/ie.js
index 0ea6d9a0..b58e60b6 100644
--- a/lib/client/ie.js
+++ b/lib/client/ie.js
@@ -170,7 +170,7 @@ var Util, DOM, $;
                     if (pObj.hasOwnProperty(n)) {
                         if (Util.isString(v))
                             v = '"' + v + '"';
-                        else if (Util.isObject(v) && v !== null)
+                        else if (v && Util.isObject(v))
                             v = DOM.stringifyJSON(v);
                             
                         json.push((isArray ? "" : '"' + n + '":') + String(v));