diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 563053db1..c92a30aef 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -236,9 +236,8 @@
     return false;
   }());
 
-  /** Detect various environments */
-  var isIeOpera = reNative.test(root.attachEvent),
-      isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera);
+  /** Used to enable optimizations for V8 */
+  var isV8 = nativeBind && !/\n/.test(nativeBind) && !reNative.test(root.attachEvent);
 
   /*--------------------------------------------------------------------------*/
 
@@ -2841,7 +2840,7 @@
   function difference(array) {
     var index = -1,
         indexOf = getIndexOf(),
-        length = array.length,
+        length = array ? array.length : 0,
         flattened = baseFlatten(arguments, true, true, 1),
         result = [];
 
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index fe423401f..9e2ed9831 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -4,35 +4,35 @@
  * Build: `lodash underscore exports="amd,commonjs,global,node" -o ./dist/lodash.underscore.js`
  */
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