From f841c17eeb1c7b53a49ca3f2bb25fa540757c8a6 Mon Sep 17 00:00:00 2001
From: Dan Helfman <dan@luminotes.com>
Date: Sat, 24 Jan 2009 23:56:28 -0800
Subject: [PATCH] Apparently 'node.tagName == "FOO"' will throw if tagName is
 undefined.

---
 static/js/Editor.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/static/js/Editor.js b/static/js/Editor.js
index b328c04..c992f8f 100644
--- a/static/js/Editor.js
+++ b/static/js/Editor.js
@@ -450,7 +450,8 @@ Editor.prototype.position_cursor = function ( div_range ) {
     else
       var range = this.document.createRange();
 
-    while ( ( last_node.nodeValue == "\n" || last_node.tagName == "BR" ) && last_node.previousSibling )
+    while ( ( last_node.nodeValue == "\n" || ( last_node.tagName && last_node.tagName == "BR" ) ) &&
+            last_node.previousSibling )
       last_node = last_node.previousSibling;
 
     range.selectNodeContents( last_node );