Bug: sort called on undefined

[prologic]

prologic@daisy
Sun Oct 26 10:27:53
~/work/docker-resource-viewer
$ dki dockerresourceviewer_monitor
TypeError: Cannot call method 'sort' of undefined
    at /app/monitor.js:55:28
    at Request._callback (/app/docker.js:23:4)
    at self.callback (/app/node_modules/request/request.js:364:22)
    at Request.emit (events.js:95:17)
    at Request.onRequestError (/app/node_modules/request/request.js:976:8)
    at ClientRequest.emit (events.js:95:17)
    at Socket.socketErrorListener (http.js:1551:9)
    at Socket.emit (events.js:95:17)
    at net.js:440:14
    at process._tickCallback (node.js:419:13)