Spotify checkToken before any critical request

src/js/services/mopidy/middleware.js

@@ -143,6 +143,9 @@ const MopidyMiddleware = (function(){
                         // play it
                         store.dispatch( actions.changeTrack( response[0].tlid ) );
 
+                        // TODO: perhaps force update of currentTlTrack before we proceed?
+                        // this will make the UI feel snappier...
+
                         // add the rest of our uris (if any)
                         action.uris.shift();
                         if( action.uris.length > 0 ){

src/js/services/mopidy/reducer.js

@@ -20,6 +20,7 @@ export default function reducer(mopidy = {}, action){
             });
 
         case 'MOPIDY_HIGHLIGHT_CURRENT_TLTRACK':
+            if( !action.data ) return mopidy;
             for( var i = 0; i < mopidy.tracks.length; i++ ){
                 if( mopidy.tracks[i].tlid == action.data.tlid ){
                     action.data.track.playing = true;