From c25bfe8a9f3ee4d8fadc1c3bc564a38f3f37dc0e Mon Sep 17 00:00:00 2001
From: Neil Jenkins <neil@nmjenkins.com>
Date: Wed, 17 Jun 2015 15:36:29 +0700
Subject: [PATCH] Fix error thrown inserting tree fragment at start/end of
 document.

---
 source/Range.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/source/Range.js b/source/Range.js
index 006a5f4..0ad115a 100644
--- a/source/Range.js
+++ b/source/Range.js
@@ -250,8 +250,9 @@ var insertTreeFragmentIntoRange = function ( range, frag ) {
             nodeBeforeSplit = next.previousSibling;
         }
         if ( !startContainer.parentNode ) {
-            startContainer = nodeBeforeSplit;
-            startOffset = nodeBeforeSplit.childNodes.length;
+            startContainer = nodeBeforeSplit || next.parentNode;
+            startOffset = nodeBeforeSplit ?
+                nodeBeforeSplit.childNodes.length : 0;
         }
         // Merge inserted containers with edges of split
         if ( isContainer( next ) ) {
@@ -277,7 +278,7 @@ var insertTreeFragmentIntoRange = function ( range, frag ) {
             endOffset = prev.childNodes.length;
         }
         // Merge inserted containers with edges of split
-        if ( isContainer( nodeAfterSplit ) ) {
+        if ( nodeAfterSplit && isContainer( nodeAfterSplit ) ) {
             mergeContainers( nodeAfterSplit );
         }