server crashes when mpd daemon restarts about groovebasin HOT 2 CLOSED

/home/andy/dev/groovebasin/lib/plugins/dynamicmode.js:123
        new_files.push(item.track.file);
                                 ^
TypeError: Cannot read property 'file' of undefined
    at DynamicMode.exports.Plugin.DynamicMode.checkDynamicMode (/home/andy/dev/groovebasin/lib/plugins/dynamicmode.js:123:34)
    at __bind (/home/andy/dev/groovebasin/lib/plugins/dynamicmode.js:3:59)
    at DirectMpd.prototype.emit (/home/andy/dev/groovebasin/node_modules/mpd/lib/mpd.js:408:11)
    at prototype.updateStatus (/home/andy/dev/groovebasin/node_modules/mpd/lib/mpd.js:596:19)
    at DirectMpd.prototype.handleMessage (/home/andy/dev/groovebasin/node_modules/mpd/lib/mpd.js:969:7)
    at DirectMpd.prototype.receive (/home/andy/dev/groovebasin/node_modules/mpd/lib/mpd.js:987:16)
    at Socket.DirectMpd.send (/home/andy/dev/groovebasin/lib/server.js:296:28)
    at Socket.EventEmitter.emit (events.js:88:17)
    at Pipe.onread (net.js:403:14)