diff --git a/src/js/utils/browser.js b/src/js/utils/browser.js
index 653d9a92a..b41276028 100644
--- a/src/js/utils/browser.js
+++ b/src/js/utils/browser.js
@@ -1,3 +1,3 @@
 export default {
-  isMac: /Mac/.test(navigator.platform)
+  isMac: window.navigator && /Mac/.test(window.navigator.platform)
 };