From 0be6bcacee2c5a352a9a2daf02a7d5a5c58dbc77 Mon Sep 17 00:00:00 2001
From: Sam <sam.saffron@gmail.com>
Date: Mon, 2 Jun 2014 10:56:16 +1000
Subject: [PATCH] PERF: optimise check

---
 app/assets/javascripts/discourse/models/post.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/app/assets/javascripts/discourse/models/post.js b/app/assets/javascripts/discourse/models/post.js
index 40acf44a24..6463b90add 100644
--- a/app/assets/javascripts/discourse/models/post.js
+++ b/app/assets/javascripts/discourse/models/post.js
@@ -318,8 +318,8 @@ Discourse.Post = Discourse.Model.extend({
       if (typeof value !== "function" && oldValue !== value) {
 
         // wishing for an identity map
-        if(key === "reply_to_user") {
-          skip = Em.get(value, "username") === Em.get(oldValue, "username");
+        if(key === "reply_to_user" && value && oldValue) {
+          skip = value.username === oldValue.username || Em.get(value, "username") === Em.get(oldValue, "username");
         }
 
         if(!skip) {