The updateAttribute callback doesn't behaves as its described. It should send the object instance alongside the error too.

lib/abstract-class.js

@@ -577,7 +577,7 @@ AbstractClass.prototype.updateAttributes = function updateAttributes(data, cb) {
     inst.isValid(function (valid) {
         if (!valid) {
             if (cb) {
-                cb(new Error('Validation error'));
+                cb(new Error('Validation error'), inst);
             }
         } else {
             update();