transit-js writer issue

error.txt

{ [Error: Cannot write ]
  data: { obj: { property_id: 25, label: 'Age', key: 'age' }, type: '' },
  domain:
   { domain: null,
     _events: { error: [Function] },
     _maxListeners: 10,
     members: [] },
  domainThrown: true }

Error: Cannot write
    at Error (<anonymous>)
    at Object.com.cognitect.transit.impl.writer.marshal (/var/data/ida-harness/node_modules/transit-js/transit.js:3614:71)
    at Object.com.cognitect.transit.impl.writer.emitObjects (/var/data/ida-harness/node_modules/transit-js/transit.js:3444:48)
    at Object.com.cognitect.transit.impl.writer.emitArray (/var/data/ida-harness/node_modules/transit-js/transit.js:3454:44)
    at Object.com.cognitect.transit.impl.writer.marshal (/var/data/ida-harness/node_modules/transit-js/transit.js:3607:50)
    at Object.com.cognitect.transit.impl.writer.marshalTop (/var/data/ida-harness/node_modules/transit-js/transit.js:3627:59)
    at com.cognitect.transit.impl.writer.Writer.write (/var/data/ida-harness/node_modules/transit-js/transit.js:3639:231)
    at getLotteryFormulaProperties.plugins.hapi-negotiator.mediaTypes.text/html (/zzz/zzz/actions/getlotteryformulaproperties.js:20:19)
    at /var/data/ida-harness/node_modules/hapi-negotiator/lib/index.js:37:7
    at /var/data/ida-harness/node_modules/hapi/lib/handler.js:424:22

output.js

{ properties: [
  { property_id: 25, label: 'Age', key: 'age' },
  { property_id: 57,
    label: 'Earned Credits',
    key: 'earned-credits' },
  { property_id: 58, label: 'GPA', key: 'gpa' } ] }