Keep PluginManager reference to avoid NPE

    private DozeMachine mDozeMachine;

    private DozeServicePlugin mDozePlugin;

    private PluginManager mPluginManager;

    public DozeService() {

        setDebug(DEBUG);

            finish();

            return;

        }

        Dependency.get(PluginManager.class).addPluginListener(this,

                DozeServicePlugin.class, false /* Allow multiple */);

        mPluginManager = Dependency.get(PluginManager.class);

        mPluginManager.addPluginListener(this, DozeServicePlugin.class, false /* allowMultiple */);

        mDozeMachine = new DozeFactory().assembleMachine(this);

    }

    @Override

    public void onDestroy() {

        Dependency.get(PluginManager.class).removePluginListener(this);

        mPluginManager.removePluginListener(this);

        super.onDestroy();

        mDozeMachine = null;

    }