diff --git a/mixin/CBind.js b/mixin/CBind.js
index 4bd4a55..614c6aa 100644
--- a/mixin/CBind.js
+++ b/mixin/CBind.js
@@ -110,6 +110,10 @@ Ext.define('Proxmox.Mixin.CBind', {
 	    var res = {}, prop, el, copy;
 	    for (prop in org) {
 		el = org[prop];
+		if (el === undefined || el === null) {
+		    res[prop] = el;
+		    continue;
+		}
 		if (el.constructor == Object && el.xtype) {
 		    copy = cloneTemplateObject(el);
 		    if (copy.cbind) {