Console doubles output after intitiating board

I have a weird behaviour since today. I'm using johnny-five and wanted to try out something right from node in the console. After initiating the board, my console output doubles, so when i type

var led = new board.Led.RGB(...);

I get

vvaarr lleedd == nneeww bbooaarr ...... (guess you get it)

Does someone have an idea how to stop this behaviour? I guessed someone had that problem before yet the search did not help me so far. I'd be happy for some input. Thanks in advance and

Greetings Chris

By the way. The code I type is just this

var five = require('johnny-five');
var board = new five.Board();

After that I get the doubled output.

via Chris