mainflux: Mainflux-mqtt exiting after sending an HTTP POST request.

When I tried this curl request as given in the tutorial, I got the output as follow:

Curl request:

curl -s -S -i -X POST -H "Accept: application/json" -H "Content-Type: application/json" http://localhost:7070/channels/fca48fe1-672a-424c-b219-a4fa6d62cc07/msg -d '[{"bn":"some-base-name:","bt":1.276020076001e+09, "bu":"A","bver":5, "n":"voltage","u":"V","v":120.1}, {"n":"current","t":-5,"v":1.2}, {"n":"current","t":-4,"v":1.3987}]'

Output:

mainflux-core    | [negroni] Started POST /channels/fca48fe1-672a-424c-b219-a4fa6d62cc07/msg
mainflux-core    | Msg written
mainflux-core    | [negroni] Completed 202 Accepted in 1.057578ms
mainflux-mqtt    | Received a message: {"topic":"mainflux/channels/fca48fe1-672a-424c-b219-a4fa6d62cc07","publisher":"","payload":"W3siYm4iOiJzb21lLWJhc2UtbmFtZToiLCJidCI6MS4yNzYwMjAwNzYwMDFlKzA5LCAiYnUiOiJBIiwiYnZlciI6NSwgIm4iOiJ2b2x0YWdlIiwidSI6IlYiLCJ2IjoxMjAuMX0sIHsibiI6ImN1cnJlbnQiLCJ0IjotNSwidiI6MS4yfSwgeyJuIjoiY3VycmVudCIsInQiOi00LCJ2IjoxLjN9XQ=="}
mainflux-mqtt    | /opt/mainflux-mqtt/mainflux-mqtt.js:86
mainflux-mqtt    | 		payload: Buffer.from(atob(m.payload)),
mainflux-mqtt    | 		                ^
mainflux-mqtt    | 
mainflux-mqtt    | TypeError: this is not a typed array.
mainflux-mqtt    |     at Function.from (native)
mainflux-mqtt    |     at Object.callback (/opt/mainflux-mqtt/mainflux-mqtt.js:86:19)
mainflux-mqtt    |     at Client.processMsg (/opt/mainflux-mqtt/node_modules/nats/lib/nats.js:892:11)
mainflux-mqtt    |     at Client.processInbound (/opt/mainflux-mqtt/node_modules/nats/lib/nats.js:824:14)
mainflux-mqtt    |     at Socket.<anonymous> (/opt/mainflux-mqtt/node_modules/nats/lib/nats.js:421:12)
mainflux-mqtt    |     at emitOne (events.js:77:13)
mainflux-mqtt    |     at Socket.emit (events.js:169:7)
mainflux-mqtt    |     at readableAddChunk (_stream_readable.js:146:16)
mainflux-mqtt    |     at Socket.Readable.push (_stream_readable.js:110:10)
mainflux-mqtt    |     at TCP.onread (net.js:523:20)
mainflux-mqtt    | 2017/01/16 10:59:18 Command exited with error: exit status 1
mainflux-mqtt exited with code 1

I tried the request with Postman (chrome extension) and got the same result. I have to restart the docker instance to get the mqtt up and running again. What might be the reason behind this? Thanks for all the help in advance.