From f643636eb360c261fcf6819b572dcb43189f4cd9 Mon Sep 17 00:00:00 2001
From: oleg8sh <oleg8sh@gmail.com>
Date: Fri, 8 Aug 2014 23:11:45 +0400
Subject: [PATCH] undefined cached checks.

 Part of #185. Should fix #162 & #163.
---
 mithril.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mithril.js b/mithril.js
index 7ba2c900..550a4345 100644
--- a/mithril.js
+++ b/mithril.js
@@ -33,7 +33,7 @@ Mithril = m = new function app(window, undefined) {
 		if (data.subtree === "retain") return cached
 
 		var cachedType = type.call(cached), dataType = type.call(data)
-		if (cachedType != dataType) {
+		if (cached === undefined || cached === null || cachedType != dataType) {
 			if (cached !== null && cached !== undefined) {
 				if (parentCache && parentCache.nodes) {
 					var offset = index - parentIndex