Prevents from sending invalid presence packets, before MUC jid is defined.

index.html

@@ -19,7 +19,7 @@
     <script src="libs/popover.js?v=1"></script><!-- bootstrap tooltip lib -->
     <script src="libs/toastr.js?v=1"></script><!-- notifications lib -->
     <script src="interface_config.js?v=5"></script>
-    <script src="libs/app.bundle.js?v=52"></script>
+    <script src="libs/app.bundle.js?v=53"></script>
     <script src="analytics.js?v=1"></script><!-- google analytics plugin -->
     <link rel="stylesheet" href="css/font.css?v=6"/>
     <link rel="stylesheet" href="css/toastr.css?v=1">

modules/xmpp/strophe.emuc.js

@@ -405,6 +405,10 @@ module.exports = function(XMPP, eventEmitter) {
                 });
         },
         sendPresence: function () {
+            if (!this.presMap['to']) {
+                // Too early to send presence - not initialized
+                return;
+            }
             var pres = $pres({to: this.presMap['to'] });
             pres.c('x', {xmlns: this.presMap['xns']});