diff --git a/app/js/init.js b/app/js/init.js
index 91aae840..96948280 100644
--- a/app/js/init.js
+++ b/app/js/init.js
@@ -1,8 +1,8 @@
-(function () {
+;(function () {
 
   // Prevent click-jacking
   try {
-    if (window.chrome && chrome.app && chrome.app.window || self == top) {
+    if (window == window.top || window.chrome && chrome.app && chrome.app.window) {
       document.documentElement.style.display = 'block';
     } else {
       top.location = self.location;
@@ -40,7 +40,7 @@
         }, delay || 300000);
       },
       attach = function () {
-        appCache.addEventListener('updateready', function(e) {
+        appCache.addEventListener('updateready', function (e) {
           if (appCache.status == appCache.UPDATEREADY) {
             if (!declined) {
               safeConfirm({type: 'WEBOGRAM_UPDATED_RELOAD', message: 'A new version of Webogram is available. Load it?'}, function (result) {
@@ -60,4 +60,4 @@
 
   scheduleUpdate(3000);
   window.addEventListener('load', attach);
-})();
\ No newline at end of file
+})();
diff --git a/app/js/lib/mtproto.js b/app/js/lib/mtproto.js
index 199352a1..a2a42976 100644
--- a/app/js/lib/mtproto.js
+++ b/app/js/lib/mtproto.js
@@ -32,9 +32,10 @@ function dHexDump (bytes) {
 }
 
 function bytesToHex (bytes) {
+  bytes = bytes || [];
   var arr = [];
   for (var i = 0; i < bytes.length; i++) {
-    arr.push((bytes[i] < 16 ? '0' : '') + bytes[i].toString(16));
+    arr.push((bytes[i] < 16 ? '0' : '') + (bytes[i] || 0).toString(16));
   }
   return arr.join('');
 }