From 9797f2ec073fae167807d27839c7d3dbad4bded9 Mon Sep 17 00:00:00 2001
From: nqounet <mail@nqou.net>
Date: Thu, 23 Oct 2014 11:07:41 +0900
Subject: [PATCH] fixed error caused by used with ExtJS

---
 src/core.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/core.js b/src/core.js
index 0adeb3a..aa586a1 100644
--- a/src/core.js
+++ b/src/core.js
@@ -10,6 +10,7 @@ function Chart(config) {
     // bind "this" to nested API
     (function bindThis(fn, target, argThis) {
         for (var key in fn) {
+            if (key === '$extIsFunction') { continue; }
             target[key] = fn[key].bind(argThis);
             if (Object.keys(fn[key]).length > 0) {
                 bindThis(fn[key], target[key], argThis);