Fetch the observer.key.path and store it in a local variable.

@@ -35,6 +35,7 @@ define(function(require) {
     rivets.binders['error-*'] = {
         bind: function(el) {
             var observer = this.observer;
+            var keyPath = observer.key.path;
             var holder = this.validationHolder = {
                 //marker: el.parentNode.insertBefore(document.createComment(" rivets: " + this.type + " "), el),
                 observer: observer,
@@ -43,15 +44,15 @@ define(function(require) {
                     render(el, 'focus', false);
                 },
                 blur: function() {
-                    holder.seen[observer.key.path] = true;
+                    holder.seen[keyPath] = true;
                     render(el, 'blur', false);
                     if (observer.target) {
                         observer.target.validate();
                     }
                 },
                 validated: function(isValid, model, errors) {
-                    var errorList = errors[observer.key.path];
-                    if (errorList && holder.seen[holder.observer.key.path]) {
+                    var errorList = errors[keyPath];
+                    if (errorList && holder.seen[keyPath]) {
                         render(el, 'validated', errorList);
                     } else {
                         render(el, 'validated', false);