1 files changed, 2 insertions, 1 deletions
diff --git a/deps/npm/node_modules/bluebird/js/release/schedule.js b/deps/npm/node_modules/bluebird/js/release/schedule.js
index f70df9fc12..15197d1433 100644
--- a/deps/npm/node_modules/bluebird/js/release/schedule.js
+++ b/deps/npm/node_modules/bluebird/js/release/schedule.js
@@ -20,7 +20,8 @@ if (util.isNode && typeof MutationObserver === "undefined") {
 } else if ((typeof MutationObserver !== "undefined") &&
           !(typeof window !== "undefined" &&
             window.navigator &&
-            (window.navigator.standalone || window.cordova))) {
+            (window.navigator.standalone || window.cordova)) &&
+          ("classList" in document.documentElement)) {
     schedule = (function() {
         var div = document.createElement("div");
         var opts = {attributes: true};