karma 0.10.0 init fails with Type Error

[stefanscheidt]

I just installed node 0.10.15 (via nvm on OS X 10.8.4) and karma 0.10.0 via npm install -g karma. Then I tried to init a project via karma init but got

path.js:313
        throw new TypeError('Arguments to path.resolve must be strings');
              ^
TypeError: Arguments to path.resolve must be strings
    at Object.exports.resolve (path.js:313:15)
    at /Users/ssc/local/nvm/v0.10.15/lib/node_modules/karma/lib/init.js:361:31
    at nextQuestion (/Users/ssc/local/nvm/v0.10.15/lib/node_modules/karma/lib/init.js:241:7)
    at onLine (/Users/ssc/local/nvm/v0.10.15/lib/node_modules/karma/lib/init.js:211:14)
    at Interface.EventEmitter.emit (events.js:95:17)
    at Interface._onLine (readline.js:202:10)
    at Interface._line (readline.js:531:8)
    at Interface._ttyWrite (readline.js:760:14)
    at ReadStream.onkeypress (readline.js:99:10)
    at ReadStream.EventEmitter.emit (events.js:117:20)