'undefined' printed after hostname and port number

[Yohanna]

When I run swagger project start, I get the following output:

Starting: D:\App\app.js...
  project started here: http://localhost:10010undefined
  project will restart on changes.
  to restart at any time, enter `rs`

Notice the undefined printed after the port number.

[andreasvirkus]

Having the same issue but no hostname nor port number defined

Starting: /code/mail-service/app.js
  project started here: http://undefined/

[dimzeta]

I have this issue too :

project started here: http://undefinedundefined