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Cannot read property '0' of undefined

See original GitHub issue

Hi I have a snippet like this (also using express-promise-router from master)

const router = require('express-promise-router')()
router.get(function(req, res) {
  return foo(req.body).then(bar => res.json(bar))
})
app.use(authstuff())
app.use(`/foo`, router)

Running tests I get

     TypeError: Cannot read property '0' of undefined
      at Route.instanceToWrap.(anonymous function) [as get] (node_modules/express-promise-router/lib/express-promise-router.js:80:87)
      at Function.proto.(anonymous function) (node_modules/express/lib/router/index.js:510:19)
      at Function.instanceToWrap.(anonymous function) [as get] (node_modules/express-promise-router/lib/express-promise-router.js:95:45)
      at Object.module.exports.router (routes/token.js:39:12)
      at Object.<anonymous> (app.js:143:18)
      at require (internal/module.js:11:18)
      at require.connect.then.then (index.js:21:25)
      at tryCatcher (node_modules/bluebird/js/release/util.js:16:23)
      at Promise._settlePromiseFromHandler (node_modules/bluebird/js/release/promise.js:512:31)
      at Promise._settlePromise (node_modules/bluebird/js/release/promise.js:569:18)
      at Promise._settlePromise0 (node_modules/bluebird/js/release/promise.js:614:10)
      at Promise._settlePromises (node_modules/bluebird/js/release/promise.js:693:18)
      at Async._drainQueue (node_modules/bluebird/js/release/async.js:133:16)
      at Async._drainQueues (node_modules/bluebird/js/release/async.js:143:10)
      at Immediate.Async.drainQueues (node_modules/bluebird/js/release/async.js:17:14)

Maybe I am not using properly or should it be a managed case?

Thanks