controllers/api.coffee:31:15 で落ちる

[shokai]

よくこれで落ちてる

> GyazzCoffee@0.0.1 start /Users/masui/Gyazz
> coffee gyazz.coffee

listening on *:6050...

http.js:689
    throw new Error('Can\'t set headers after they are sent.');
          ^
Error: Can't set headers after they are sent.
  at ServerResponse.OutgoingMessage.setHeader (http.js:689:11)
  at ServerResponse.header (/Users/masui/Gyazz/node_modules/express/lib/response.js:592:10)
  at ServerResponse.res.location (/Users/masui/Gyazz/node_modules/express/lib/response.js:706:8)
  at ServerResponse.redirect (/Users/masui/Gyazz/node_modules/express/lib/response.js:745:8)
  at /Users/masui/Gyazz/controllers/api.coffee:31:15
  at Promise.<anonymous> (/Users/masui/Gyazz/models/attr.coffee:43:7)
  at Promise.<anonymous> (/Users/masui/Gyazz/node_modules/mongoose/node_modules/mpromise/lib/promise.js:177:8)
  at Promise.emit (events.js:95:17)
  at Promise.emit (/Users/masui/Gyazz/node_modules/mongoose/node_modules/mpromise/lib/promise.js:84:38)
  at Promise.fulfill (/Users/masui/Gyazz/node_modules/mongoose/node_modules/mpromise/lib/promise.js:97:20)
  at Promise.resolve (/Users/masui/Gyazz/node_modules/mongoose/lib/promise.js:108:23)
  at Promise.<anonymous> (/Users/masui/Gyazz/node_modules/mongoose/node_modules/mpromise/lib/promise.js:177:8)
  at Promise.emit (events.js:95:17)
  at Promise.emit (/Users/masui/Gyazz/node_modules/mongoose/node_modules/mpromise/lib/promise.js:84:38)
  at Promise.fulfill (/Users/masui/Gyazz/node_modules/mongoose/node_modules/mpromise/lib/promise.js:97:20)
  at /Users/masui/Gyazz/node_modules/mongoose/lib/query.js:1394:13
  at model.Document.init (/Users/masui/Gyazz/node_modules/mongoose/lib/document.js:250:11)
  at completeOne (/Users/masui/Gyazz/node_modules/mongoose/lib/query.js:1392:10)
  at Object.cb (/Users/masui/Gyazz/node_modules/mongoose/lib/query.js:1151:11)
  at Object._onImmediate (/Users/masui/Gyazz/node_modules/mongoose/node_modules/mquery/lib/utils.js:137:16)
  at processImmediate [as _immediateCallback] (timers.js:336:15)