babel-node issue

babel-node throws an error when I hit ctrl+c instead of exiting clean. Why?

Quick start

git clone https://github.com/coryhouse/babel-node.git
cd babel-node
npm install
npm run start-babel-node
ctrl+c

Note that you get an error after hitting ctrl+c to kill Express. Why? Any way to force babel-node to return 0? Note that if you run npm start, ctrl+c kills Express just fine.