Merge pull request #223 from hnb2/fix_webmaf_polyfill

Supporting polyfill for WebMAF

Author: stefanpenner

lib/es6-promise/polyfill.js

@@ -18,8 +18,17 @@ export default function polyfill() {
 
   var P = local.Promise;
 
-  if (P && Object.prototype.toString.call(P.resolve()) === '[object Promise]' && !P.cast) {
-    return;
+  if (P) {
+    var promiseToString = null;
+    try {
+        promiseToString = Object.prototype.toString.call(P.resolve());
+    } catch(e) {
+        // silently ignored
+    }
+
+    if (promiseToString === '[object Promise]' && !P.cast){
+        return;
+    }
   }
 
   local.Promise = Promise;