updated library

app.js

 
 
     room.on(ConferenceEvents.TRACK_ADDED, function (track) {
-        if (!track.getParticipantId) { // skip local tracks
+        if (track.isLocal) { // skip local tracks
             return;
         }
         console.error(
         APP.UI.addRemoteStream(track);
     });
     room.on(ConferenceEvents.TRACK_REMOVED, function (track) {
-        if (!track.getParticipantId) { // skip local tracks
+        if (track.isLocal) { // skip local tracks
             return;
         }
 

lib-jitsi-meet.js

     this.dontFireRemoveEvent = false;
     this.resolution = resolution;
     this.startMuted = false;
+    this.isLocal = true;
     var self = this;
     JitsiTrack.call(this, null, stream,
         function () {
     this.videoType = data.videoType;
     this.ssrc = ssrc;
     this.muted = false;
+    this.isLocal = false;
     if((this.type === JitsiTrack.AUDIO && data.audiomuted)
       || (this.type === JitsiTrack.VIDEO && data.videomuted)) {
         this.muted = true;
  */
 JitsiRemoteTrack.prototype.isMuted = function () {
     return this.muted;
-}
+};
 
 /**
  * Returns the participant id which owns the track.
  */
 JitsiRemoteTrack.prototype.isLocal = function () {
     return false;
-}
+};
 
 delete JitsiRemoteTrack.prototype.stop;