diff --git a/lib/ZPAccessory.js b/lib/ZPAccessory.js
index 630be2c..b2de9a8 100644
--- a/lib/ZPAccessory.js
+++ b/lib/ZPAccessory.js
@@ -261,19 +261,20 @@ ZPAccessory.prototype.handleAVTransportEvent = function(data) {
       if (data) {
         this.parser.parseString(data, function(err, json) {
           if (!err && json['DIDL-Lite']) {
-            const type = json['DIDL-Lite'].item[0].res[0]._;
+            const item = json['DIDL-Lite'].item[0];
+            const type = item.res[0]._;
             switch (type.split(':')[0]) {
               case 'x-rincon-stream': // Line in input.
-                track = json['DIDL-Lite'].item[0]['dc:title'][0]; // source
+                track = item['dc:title'][0]; // source
                 break;
               case 'x-sonos-htastream': // SPDIF TV input.
                 track = 'TV';
-                const streamInfo = json['DIDL-Lite'].item[0]['r:streamInfo'][0];
+                const streamInfo = item['r:streamInfo'][0];
                 // "0": no input; "2": stereo; "18": Dolby Digital 5.1;
                 on = streamInfo !== "0";
                 break;
               case 'x-sonosapi-stream': // Radio stream.
-                track = json['DIDL-Lite'].item[0]['r:streamContent'][0]; // info
+                track = item['r:streamContent'][0]; // info
                 if (track === '') {
                   if (event['r:EnqueuedTransportURIMetaData']) {
                     const data = event['r:EnqueuedTransportURIMetaData'][0].$.val;
@@ -289,12 +290,18 @@ ZPAccessory.prototype.handleAVTransportEvent = function(data) {
                 break;
               case 'x-file-cifs':		    // Library song.
               case 'x-sonos-spotify':		// Spotify song.
-                /* falls through */
-              default:
-                track = json['DIDL-Lite'].item[0]['dc:title'][0]; // song
-                // track = json['DIDL-Lite'].item[0]['dc:creator'][0]; // artist
-                // track = json['DIDL-Lite'].item[0]['upnp:album'][0]; // album
-                // track = json['DIDL-Lite'].item[0].res[0].$.duration; // duration
+                track = item['dc:title'][0]; // song
+                // track = item['dc:creator'][0]; // artist
+                // track = item['upnp:album'][0]; // album
+                // track = item.res[0].$.duration; // duration
+                break;
+               default:
+                if (item['dc:title']) {
+                  track = item['dc:title'][0]; // song
+                } else {
+                  this.log.warn('%s: unknown track metadata %j', this.name, item);
+                  track = '(unknown)';
+                }
                 break;
             }
           }