diff --git a/api/WebApi.ts b/api/WebApi.ts
index 3f475a1..2634a8b 100644
--- a/api/WebApi.ts
+++ b/api/WebApi.ts
@@ -42,7 +42,7 @@ import os = require('os');
 import url = require('url');
 import path = require('path');
 
-const isBrowser: boolean = typeof window !== 'undefined';
+const isBrowser: boolean = typeof window !== 'undefined' && Boolean(window.navigator);
 /**
  * Methods to return handler objects (see handlers folder)
  */