Error: Can't set headers after they are sent

[Nowaker]

Number of exceptions: 4000 in 1 day. (Hacker News effect)
Seen on: 0.7.14

[2014-10-29T22:36:15.843Z] [4008] [Uncaught exception] Error: Can't set headers after they are sent.
    at ServerResponse.OutgoingMessage.setHeader (http.js:689:11)
    at ServerResponse.setWriteHeadHeaders (/usr/lib/node_modules/http-master/node_modules/compression/node_modules/on-headers/index.js:80:19)
    at ServerResponse.writeHead (/usr/lib/node_modules/http-master/node_modules/compression/node_modules/on-headers/index.js:39:36)
    at Server.finish (/usr/lib/node_modules/http-master/node_modules/node-static/lib/node-static.js:123:17)
    at finish (/usr/lib/node_modules/http-master/node_modules/node-static/lib/node-static.js:168:14)
    at /usr/lib/node_modules/http-master/node_modules/node-static/lib/node-static.js:339:13
    at streamFile (/usr/lib/node_modules/http-master/node_modules/node-static/lib/node-static.js:385:13)
    at ReadStream.fs.createReadStream.on.on.on.pipe.end (/usr/lib/node_modules/http-master/node_modules/node-static/lib/node-static.js:378:17)
    at ReadStream.emit (events.js:117:20)
    at fs.js:1609:14
    at Object.oncomplete (fs.js:107:15)