diff --git a/app/assets/javascripts/discourse/lib/url.js.es6 b/app/assets/javascripts/discourse/lib/url.js.es6
index e7f46eb8709..d26dffa7b90 100644
--- a/app/assets/javascripts/discourse/lib/url.js.es6
+++ b/app/assets/javascripts/discourse/lib/url.js.es6
@@ -158,7 +158,7 @@ const DiscourseURL = Ember.Object.extend({
       return false;
     }
 
-    if (a.host !== document.location.host) {
+    if (a.host && a.host !== document.location.host) {
       document.location = a.href;
       return false;
     }