diff --git a/lib/schema.js b/lib/schema.js
index 6696cf45..681d873f 100644
--- a/lib/schema.js
+++ b/lib/schema.js
@@ -158,6 +158,8 @@ Schema.prototype.define = function defineClass(className, properties, settings)
     if (args.length == 1) properties = {}, args.push(properties);
     if (args.length == 2) settings   = {}, args.push(settings);
 
+    settings = settings || {};
+
     standartize(properties, settings);
 
     // every class can receive hash of data as optional param