WARN IoService socketOnClose() event.wasClean FALSE

[huan]

https://travis-ci.org/Chatie/angular/jobs/376557494

WARN: '21:15:41 WARN IoService socketOnClose() event.wasClean FALSE'
e 0.0.0 (Linux 0.0.0): Executed 5 of 5 (1 FAILED) (0 secs / 0 secs)
ise rejection:', 'Cannot read property 'readyState' of null', '; Zone:', 'ProxyZone', '; Task:', 'Promise.then', '; Value:', TypeError: Cannot read property 'readyState' of null
TypeError: Cannot read property 'readyState' of null
    at IoService.webpackJsonp../src/wechaty/io.ts.IoService.socketUpdateState (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:377:62)
    at IoService.<anonymous> (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:331:10)
    at step (http://localhost:9876/_karma_webpack_/main.bundle.js:303:23)
    at Object.next (http://localhost:9876/_karma_webpack_/main.bundle.js:284:53)
    at http://localhost:9876/_karma_webpack_/main.bundle.js:278:71
    at new ZoneAwarePromise (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/dist/zone.js:891:1)
    at webpackJsonp../src/wechaty/io.ts.__awaiter (http://localhost:9876/_karma_webpack_/main.bundle.js:274:12)
    at IoService.webpackJsonp../src/wechaty/io.ts.IoService.socketClose (http://localhost:9876/_karma_webpack_/main.bundle.js:615:16)
    at IoService.<anonymous> (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:171:16)
    at step (http://localhost:9876/_karma_webpack_/main.bundle.js:303:23), 'TypeError: Cannot read property 'readyState' of null
    at IoService.webpackJsonp../src/wechaty/io.ts.IoService.socketUpdateState (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:377:62)
    at IoService.<anonymous> (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:331:10)
    at step (http://localhost:9876/_karma_webpack_/main.bundle.js:303:23)
    at Object.next (http://localhost:9876/_karma_webpack_/main.bundle.js:284:53)
    at http://localhost:9876/_karma_webpack_/main.bundle.js:278:71
    at new ZoneAwarePromise (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/dist/zone.js:891:1)
    at webpackJsonp../src/wechaty/io.ts.__awaiter (http://localhost:9876/_karma_webpack_/main.bundle.js:274:12)
    at IoService.webpackJsonp../src/wechaty/io.ts.IoService.socketClose (http://localhost:9876/_karma_webpack_/main.bundle.js:615:16)
    at IoService.<anonymous> (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:171:16)
    at step (http://localhost:9876/_karma_webpack_/main.bundle.js:303:23)'
HeadlessChrome 0.0.0 (Linux 0.0.0): Executed 5 of 5 (1 FAILED) (0 secs / 0 secs)
ERROR: 'Unhandled Promise rejection:', 'Cannot read property 'readyState' of null', '; Zone:', 'ProxyZone', '; Task:', 'Promise.then', '; Value:', TypeError: Cannot read property 'readyState' of null
TypeError: Cannot read property 'readyState' of null
    at IoService.webpackJsonp../src/wechaty/io.ts.IoService.socketUpdateState (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:377:62)
    at IoService.<anonymous> (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:331:10)
    at step (http://localhost:9876/_karma_webpack_/main.bundle.js:303:23)
    at Object.next (http://localhost:9876/_karma_webpack_/main.bundle.js:284:53)
    at http://localhost:9876/_karma_webpack_/main.bundle.js:278:71
    at new ZoneAwarePromise (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/dist/zone.js:891:1)
    at webpackJsonp../src/wechaty/io.ts.__awaiter (http://localhost:9876/_karma_webpack_/main.bundle.js:274:12)
    at IoService.webpackJsonp../src/wechaty/io.ts.IoService.socketClose (http://localhost:9876/_karma_webpack_/main.bundle.js:615:16)
    at IoService.<anonymous> (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:171:16)
    at step (http://localhost:9876/_karma_webpack_/main.bundle.js:303:23), 'TypeError: Cannot read property 'readyState' of null
    at IoService.webpackJsonp../src/wechaty/io.ts.IoService.socketUpdateState (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:377:62)
    at IoService.<anonymous> (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:331:10)
    at step (http://localhost:9876/_karma_webpack_/main.bundle.js:303:23)
    at Object.next (http://localhost:9876/_karma_webpack_/main.bundle.js:284:53)
    at http://localhost:9876/_karma_webpack_/main.bundle.js:278:71
    at new ZoneAwarePromise (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/dist/zone.js:891:1)
    at webpackJsonp../src/wechaty/io.ts.__awaiter (http://localhost:9876/_karma_webpack_/main.bundle.js:274:12)
    at IoService.webpackJsonp../src/wechaty/io.ts.IoService.socketClose (http://localhost:9876/_karma_webpack_/main.bundle.js:615:16)
    at IoService.<anonymous> (http://localhost:9876/_karma_webpack_/webpack:/src/wechaty/io.ts:171:16)
    at step (http://localhost:9876/_karma_webpack_/main.bundle.js:303:23)'