diff --git a/templates/default/tmpl/properties.tmpl b/templates/default/tmpl/properties.tmpl
index dfa6ee0e..97a3d23a 100644
--- a/templates/default/tmpl/properties.tmpl
+++ b/templates/default/tmpl/properties.tmpl
@@ -5,7 +5,7 @@
     var parentProp = null;
     props.forEach(function(prop, i) {
         if (!prop) { return; }
-        if ( parentProp && prop.name.indexOf(parentProp.name + '.') === 0 ) {
+        if ( parentProp && prop.name && prop.name.indexOf(parentProp.name + '.') === 0 ) {
             prop.name = prop.name.substr(parentProp.name.length+1);
             parentProp.subprops = parentProp.subprops || [];
             parentProp.subprops.push(prop);