browser.js in speed_gun-0.0.4

- old
+ new

@@ -5,9 +5,13 @@
 
   speedGun.sendBrowserInfo = function() {
     var data = {};
     var p = window['performance'];
 
+    if(!p) {
+      return;
+    }
+
     data.user_agent = navigator.userAgent;
 
     if(p['navigation']) {
       data.navigation = {
         type: p.navigation.type,