strange intermittent error

gistfile1.txt

dgram.js:147
  newHandle.lookup = self._handle.lookup;
                   ^
TypeError: Cannot set property 'lookup' of undefined
    at replaceHandle (dgram.js:147:20)
    at dgram.js:201:9
    at Object.10:8921 (cluster.js:592:5)
    at handleResponse (cluster.js:171:41)
    at respond (cluster.js:192:5)
    at handleMessage (cluster.js:202:5)
    at process.emit (events.js:117:20)
    at handleMessage (child_process.js:322:10)
    at child_process.js:396:7
    at process.handleConversion.dgram.Native.got (child_process.js:175:7)