diff --git a/app/index.html b/app/index.html
index 3ecffbef..6f610aca 100644
--- a/app/index.html
+++ b/app/index.html
@@ -31,7 +31,7 @@
      ga('send', 'pageview');
   </script>
 
-  <script type="text/javascript" src="vendor/console-polyfill/console-polyfill.js"></script>
+  <script type="text/javascript" src="vendor/console-polyfill/console-polyfill.js?1"></script>
   <script type="text/javascript" src="vendor/jquery/jquery.min.js"></script>
   <script type="text/javascript" src="vendor/jquery.nanoscroller/nanoscroller.js"></script>
   <script type="text/javascript" src="vendor/jquery.emojiarea/jquery.emojiarea.js"></script>
@@ -48,7 +48,7 @@
 
 
   <script type="text/javascript" src="js/lib/config.js"></script>
-  <script type="text/javascript" src="js/lib/mtproto.js?12"></script>
+  <script type="text/javascript" src="js/lib/mtproto.js?13"></script>
 
   <script type="text/javascript" src="js/util.js"></script>
   <script type="text/javascript" src="js/app.js?5"></script>
diff --git a/app/js/lib/aes_worker.js b/app/js/lib/aes_worker.js
index fe1ff83b..974b9ab6 100644
--- a/app/js/lib/aes_worker.js
+++ b/app/js/lib/aes_worker.js
@@ -5,7 +5,12 @@
  * https://github.com/zhukov/webogram/blob/master/LICENSE
  */
 
-importScripts('mtproto.js', '../../vendor/jsbn/jsbn_combined.js', '../../vendor/cryptoJS/crypto.js');
+importScripts(
+  '../../vendor/console-polyfill/console-polyfill.js?1',
+  'mtproto.js',
+  '../../vendor/jsbn/jsbn_combined.js',
+  '../../vendor/cryptoJS/crypto.js'
+);
 
 onmessage = function (e) {
   // console.log('AES worker in', e.data);
diff --git a/app/js/lib/mtproto.js b/app/js/lib/mtproto.js
index 9a2d56d2..846a0c07 100644
--- a/app/js/lib/mtproto.js
+++ b/app/js/lib/mtproto.js
@@ -1113,7 +1113,7 @@ factory('MtpAuthorizer', function (MtpDcConfigurator, MtpRsaKeysManager, MtpSecu
 
       console.log('PQ factorization start');
       if (!!window.Worker) {
-        var worker = new Worker('js/lib/pq_worker.js');
+        var worker = new Worker('js/lib/pq_worker.js?1');
 
         worker.onmessage = function (e) {
           auth.p = e.data[0];
@@ -1407,7 +1407,7 @@ factory('MtpAesService', function ($q) {
     };
   }
 
-  var worker = new Worker('js/lib/aes_worker.js'),
+  var worker = new Worker('js/lib/aes_worker.js?1'),
       taskID = 0,
       awaiting = {};
 
@@ -1459,7 +1459,7 @@ factory('MtpSha1Service', function ($q) {
     };
   }
 
-  var worker = new Worker('js/lib/sha1_worker.js'),
+  var worker = new Worker('js/lib/sha1_worker.js?1'),
       taskID = 0,
       awaiting = {};
 
@@ -1511,13 +1511,7 @@ factory('MtpNetworkerFactory', function (MtpDcConfigurator, MtpMessageIdGenerato
     //   })();
     // }
 
-    this.sessionID = new Array(8);
-    MtpSecureRandom.nextBytes(this.sessionID);
-
-    if (false) {
-      this.sessionID[0] = 0xAB;
-      this.sessionID[1] = 0xCD;
-    }
+    this.updateSession();
 
     this.seqNo = 0;
     this.currentRequests = 0;
@@ -1537,6 +1531,15 @@ factory('MtpNetworkerFactory', function (MtpDcConfigurator, MtpMessageIdGenerato
     this.checkLongPoll();
   };
 
+  MtpNetworker.prototype.updateSession = function () {
+    this.sessionID = new Array(8);
+    MtpSecureRandom.nextBytes(this.sessionID);
+
+    if (false) {
+      this.sessionID[0] = 0xAB;
+      this.sessionID[1] = 0xCD;
+    }
+  }
 
   MtpNetworker.prototype.generateSeqNo = function (notContentRelated) {
     var seqNo = this.seqNo * 2;
@@ -2046,6 +2049,7 @@ factory('MtpNetworkerFactory', function (MtpDcConfigurator, MtpMessageIdGenerato
 
         if (message.error_code == 16 || message.error_code == 17) {
           MtpMessageIdGenerator.applyServerTime((new BigInteger(messageID, 10)).shiftRight(32).toString(10));
+          this.updateSession();
           this.pushResend(message.bad_msg_id);
           this.ackMessage(messageID);
         }
@@ -2229,7 +2233,7 @@ factory('MtpApiManager', function (AppConfigManager, MtpAuthorizer, MtpNetworker
         },
         function (error) {
           console.log('error', error.code, error.type, baseDcID, dcID);
-          if (error.code == 401 && error.type == 'AUTH_KEY_UNREGISTERED' && baseDcID && dcID != baseDcID) {
+          if (error.code == 401 && baseDcID && dcID != baseDcID) {
             if (cachedExportPromise[dcID] === undefined) {
               var exportDeferred = $q.defer();
 
diff --git a/app/js/lib/pq_worker.js b/app/js/lib/pq_worker.js
index d076b49f..8d3c2f42 100644
--- a/app/js/lib/pq_worker.js
+++ b/app/js/lib/pq_worker.js
@@ -5,7 +5,11 @@
  * https://github.com/zhukov/webogram/blob/master/LICENSE
  */
 
-importScripts('mtproto.js', '../../vendor/jsbn/jsbn_combined.js');
+importScripts(
+  '../../vendor/console-polyfill/console-polyfill.js?1',
+  'mtproto.js',
+  '../../vendor/jsbn/jsbn_combined.js'
+);
 
 onmessage = function (e) {
   postMessage(pqPrimeFactorization(e.data));
diff --git a/app/js/lib/sha1_worker.js b/app/js/lib/sha1_worker.js
index 44a35fb5..809dd0cb 100644
--- a/app/js/lib/sha1_worker.js
+++ b/app/js/lib/sha1_worker.js
@@ -5,7 +5,11 @@
  * https://github.com/zhukov/webogram/blob/master/LICENSE
  */
 
-importScripts('mtproto.js', '../../vendor/cryptoJS/crypto.js');
+importScripts(
+  '../../vendor/console-polyfill/console-polyfill.js?1',
+  'mtproto.js',
+  '../../vendor/cryptoJS/crypto.js'
+);
 
 onmessage = function (e) {
   var taskID = e.data.taskID;
diff --git a/app/vendor/console-polyfill/console-polyfill.js b/app/vendor/console-polyfill/console-polyfill.js
index b16dbfaa..1ad5859f 100644
--- a/app/vendor/console-polyfill/console-polyfill.js
+++ b/app/vendor/console-polyfill/console-polyfill.js
@@ -12,4 +12,6 @@
      'time,timeEnd,trace,warn').split(',');
   while (prop = properties.pop()) con[prop] = con[prop] || empty;
   while (method = methods.pop()) con[method] = con[method] || dummy;
-})(window.console = window.console || {});
+})(this.console = this.console || {});
+
+// For Workers compatibility `window` object is replaced with `this` keyword
\ No newline at end of file