From 0e79858d56b2ce5becab8929b09746e7157a44cb Mon Sep 17 00:00:00 2001
From: Jason Chen <jhchen7@gmail.com>
Date: Thu, 21 Jul 2016 12:59:28 -0700
Subject: [PATCH] fix #809

---
 core/quill.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/core/quill.js b/core/quill.js
index 194ea0e8f8..410ead6658 100644
--- a/core/quill.js
+++ b/core/quill.js
@@ -292,8 +292,10 @@ class Quill {
       delta = new Delta(delta.slice());
     }
     let change = this.editor.applyDelta(delta, source);
-    range = shiftRange(range, change, source);
-    this.setSelection(range, Emitter.sources.SILENT);
+    if (range != null) {
+      range = shiftRange(range, change, source);
+      this.setSelection(range, Emitter.sources.SILENT);
+    }
     return change;
   }
 }