From a0cd024b397df5ddf926ce640be9d44f7ae09166 Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Sun, 30 Aug 2015 10:09:28 -0700
Subject: [PATCH] Add checks to `iteratorSymbol` assignment.

---
 lodash.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lodash.js b/lodash.js
index b8fadaf8c..cab1b297f 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1329,7 +1329,7 @@
         clearTimeout = context.clearTimeout,
         enumerate = Reflect ? Reflect.enumerate : undefined,
         getPrototypeOf = Object.getPrototypeOf,
-        iteratorSymbol = Symbol.iterator,
+        iteratorSymbol = typeof (iteratorSymbol = Symbol && Symbol.iterator) == 'symbol' ? iteratorSymbol : undefined,
         parseFloat = context.parseFloat,
         pow = Math.pow,
         propertyIsEnumerable = objectProto.propertyIsEnumerable,
@@ -8677,7 +8677,7 @@
       if (isArrayLike(value)) {
         return value.length ? copyArray(value) : [];
       }
-      if (value[iteratorSymbol]) {
+      if (iteratorSymbol && value[iteratorSymbol]) {
         return iteratorToArray(value[iteratorSymbol]());
       }
       var tag = objToString.call(value),