dbus-native BlueZ unmarshall error

output.txt

{ name: '/',
  service: 
   { name: 'org.bluez',
     bus: 
      { connection: [Object],
        serial: 2,
        cookies: [Object],
        methodCallHandlers: {},
        signals: [Object],
        exportedObjects: {},
        invoke: [Function],
        invokeDbus: [Function],
        mangle: [Function],
        sendSignal: [Function],
        sendError: [Function],
        sendReply: [Function],
        setMethodCallHandler: [Function],
        exportInterface: [Function],
        getService: [Function],
        getObject: [Function],
        getInterface: [Function],
        addMatch: [Function],
        removeMatch: [Function],
        getId: [Function],
        requestName: [Function],
        releaseName: [Function],
        listNames: [Function],
        listActivatableNames: [Function],
        updateActivationEnvironment: [Function],
        startServiceByName: [Function],
        getConnectionUnixUser: [Function],
        getConnectionUnixProcessId: [Function],
        getNameOwner: [Function],
        nameHasOwner: [Function] },
     getObject: [Function],
     getInterface: [Function] },
  as: [Function] }
{ name: 'xml', type: 's', direction: 'out' }
    method:  Introspect 
{ name: 'properties', type: 'a{sv}', direction: 'out' }
    method:  GetProperties 
{ name: 'adapter', type: 'o', direction: 'out' }
    method:  DefaultAdapter 
{ name: 'pattern', type: 's', direction: 'in' }
{ name: 'adapter', type: 'o', direction: 'out' }
    method:  FindAdapter s
{ name: 'adapters', type: 'ao', direction: 'out' }
    method:  ListAdapters 
============    signal:  PropertyChanged
============    signal:  AdapterAdded
============    signal:  AdapterRemoved
============    signal:  DefaultAdapterChanged
{ name: '/org/bluez/536/hci0',
  service: 
   { name: 'org.bluez',
     bus: 
      { connection: [Object],
        serial: 4,
        cookies: {},
        methodCallHandlers: {},
        signals: [Object],
        exportedObjects: {},
        invoke: [Function],
        invokeDbus: [Function],
        mangle: [Function],
        sendSignal: [Function],
        sendError: [Function],
        sendReply: [Function],
        setMethodCallHandler: [Function],
        exportInterface: [Function],
        getService: [Function],
        getObject: [Function],
        getInterface: [Function],
        addMatch: [Function],
        removeMatch: [Function],
        getId: [Function],
        requestName: [Function],
        releaseName: [Function],
        listNames: [Function],
        listActivatableNames: [Function],
        updateActivationEnvironment: [Function],
        startServiceByName: [Function],
        getConnectionUnixUser: [Function],
        getConnectionUnixProcessId: [Function],
        getNameOwner: [Function],
        nameHasOwner: [Function],
        name: ':1.261' },
     getObject: [Function],
     getInterface: [Function] },
  as: [Function] }
{ name: 'xml', type: 's', direction: 'out' }
    method:  Introspect 
{ name: 'properties', type: 'a{sv}', direction: 'out' }
    method:  GetProperties 
{ name: 'name', type: 's', direction: 'in' }
{ name: 'value', type: 'v', direction: 'in' }
    method:  SetProperty sv
    method:  RequestSession 
    method:  ReleaseSession 
    method:  StartDiscovery 
    method:  StopDiscovery 
{ name: 'devices', type: 'ao', direction: 'out' }
    method:  ListDevices 
{ name: 'address', type: 's', direction: 'in' }
{ name: 'device', type: 'o', direction: 'out' }
    method:  CreateDevice s
{ name: 'address', type: 's', direction: 'in' }
{ name: 'agent', type: 'o', direction: 'in' }
{ name: 'capability', type: 's', direction: 'in' }
{ name: 'device', type: 'o', direction: 'out' }
    method:  CreatePairedDevice sos
{ name: 'address', type: 's', direction: 'in' }
    method:  CancelDeviceCreation s
{ name: 'device', type: 'o', direction: 'in' }
    method:  RemoveDevice o
{ name: 'address', type: 's', direction: 'in' }
{ name: 'device', type: 'o', direction: 'out' }
    method:  FindDevice s
{ name: 'agent', type: 'o', direction: 'in' }
{ name: 'capability', type: 's', direction: 'in' }
    method:  RegisterAgent os
{ name: 'agent', type: 'o', direction: 'in' }
    method:  UnregisterAgent o
============    signal:  PropertyChanged
============    signal:  DeviceCreated
============    signal:  DeviceRemoved
============    signal:  DeviceFound
============    signal:  DeviceDisappeared
{ name: 'record', type: 's', direction: 'in' }
{ name: 'handle', type: 'u', direction: 'out' }
    method:  AddRecord s
{ name: 'handle', type: 'u', direction: 'in' }
{ name: 'record', type: 's', direction: 'in' }
    method:  UpdateRecord us
{ name: 'handle', type: 'u', direction: 'in' }
    method:  RemoveRecord u
{ name: 'address', type: 's', direction: 'in' }
{ name: 'handle', type: 'u', direction: 'in' }
    method:  RequestAuthorization su
    method:  CancelAuthorization 
{ name: 'address', type: 's', direction: 'in' }
{ name: 'hash', type: 'ay', direction: 'in' }
{ name: 'randomizer', type: 'ay', direction: 'in' }
    method:  AddRemoteData sayay
{ name: 'address', type: 's', direction: 'in' }
    method:  RemoveRemoteData s
{ name: 'hash', type: 'ay', direction: 'out' }
{ name: 'randomizer', type: 'ay', direction: 'out' }
    method:  ReadLocalData 
{ name: 'uuid', type: 's', direction: 'in' }
{ name: 'bridge', type: 's', direction: 'in' }
    method:  Register ss
{ name: 'uuid', type: 's', direction: 'in' }
    method:  Unregister s
{ name: 'pattern', type: 's', direction: 'in' }
{ name: 'address', type: 's', direction: 'in' }
{ name: 'path', type: 's', direction: 'out' }
    method:  CreateProxy ss
{ name: 'paths', type: 'as', direction: 'out' }
    method:  ListProxies 
{ name: 'path', type: 's', direction: 'in' }
    method:  RemoveProxy s
============    signal:  ProxyCreated
============    signal:  ProxyRemoved
{ name: 'properties', type: 'a{sv}', direction: 'out' }
    method:  GetProperties 
    method:  Disconnect 
============    signal:  PropertyChanged
{ name: 'endpoint', type: 'o', direction: 'in' }
{ name: 'properties', type: 'a{sv}', direction: 'in' }
    method:  RegisterEndpoint oa{sv}
{ name: 'endpoint', type: 'o', direction: 'in' }
    method:  UnregisterEndpoint o
{ name: 'player', type: 'o', direction: 'in' }
{ name: 'properties', type: 'a{sv}', direction: 'in' }
{ name: 'metadata', type: 'a{sv}', direction: 'in' }
    method:  RegisterPlayer oa{sv}a{sv}
{ name: 'player', type: 'o', direction: 'in' }
    method:  UnregisterPlayer o
properties = 
[ [ '', [ [], [] ] ],
  [ 'ess\u0000\u0001s\u0000\u0000\u0011\u0000\u0000\u000000:19:0E:11:28:17\u0000\u0000\u0000\u0004\u0000\u0000\u0000Name\u0000\u0001s\u0000\u0010\u0000\u0000\u0000mistry-desktop-0\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0005\u0000\u0000\u0000Class\u0000\u0001u\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0007\u0000\u0000\u0000Powered\u0000\u0001b\u0000\u0000\u0001\u0000\u0000\u0000\u0000\u0000\u0000\u0000\f\u0000\u0000\u0000Discoverable\u0000\u0001b\u0000\u0000\u0000\u0000\u0000\b\u0000\u0000\u0000Pairable\u0000\u0001b\u0000\u0001\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0013\u0000\u0000\u0000DiscoverableTimeout\u0000\u0001u\u0000\u0000<\u0000\u0000\u0000\u000f\u0000\u0000\u0000PairableTimeout\u0000\u0001u\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u000b\u0000\u0000\u0000Discovering\u0000\u0001b\u0000\u0000\u0000\u0000\u0000\u0000\u0007\u0000\u0000\u0000Devices\u0000\u0002ao\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0005\u0000\u0000\u0000UUIDs\u0000\u0002as\u0000\u0000\u00009\u0002\u0000\u0000$\u0000\u0000\u000000001000-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u000000001001-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u00000000112d-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u000000001112-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u00000000111f-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u00000000111e-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u00000000110a-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u00000000110b-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u00000000110c-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u00000000110e-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u000000001103-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u000000001105-0000-1000-8000-00805f9b34fb\u0000\u0000\u0000\u0000$\u0000\u0000\u000000001106-0000-1000-8000-00805f9b',
    [ [], [] ] ] ]

/home/mistry/bluez/node_modules/dbus-native/lib/unmarshall.js:28
    switch (tree.type) {
                ^
TypeError: Cannot read property 'type' of undefined
    at read (/home/mistry/bluez/node_modules/dbus-native/lib/unmarshall.js:28:17)
    at readElement (/home/mistry/bluez/node_modules/dbus-native/lib/unmarshall.js:91:9)
    at readStruct (/home/mistry/bluez/node_modules/dbus-native/lib/unmarshall.js:104:5)
    at /home/mistry/bluez/node_modules/dbus-native/lib/unmarshall.js:71:9
    at Object.<anonymous> (/home/mistry/bluez/node_modules/dbus-native/lib/unmarshall.js:180:17)
    at Object.self.tap (/home/mistry/bluez/node_modules/dbus-native/node_modules/binary/index.js:191:12)
    at Object.<anonymous> (/home/mistry/bluez/node_modules/dbus-native/lib/unmarshall.js:177:53)
    at Object.self.tap (/home/mistry/bluez/node_modules/dbus-native/node_modules/binary/index.js:191:12)
    at readSimpleType (/home/mistry/bluez/node_modules/dbus-native/lib/unmarshall.js:176:35)
    at readVariant (/home/mistry/bluez/node_modules/dbus-native/lib/unmarshall.js:62:5)

test.js

var dbus = require('dbus-native');

var systemBus = dbus.systemBus();
var bluezService = systemBus.getService('org.bluez');

bluezService.getInterface('/', 'org.bluez.Manager', function(err, managerInterface) {
  managerInterface.DefaultAdapter(function(err, defaultAdapter) {  
    bluezService.getInterface(defaultAdapter, 'org.bluez.Adapter', function(err, defaultAdapterInterface) {
      defaultAdapterInterface.GetProperties(function(err, properties) {
        console.log('properties = ');
        console.log(properties);
      });
    });
  });
});