Runtime Error : Uncaught in Promise ( Undefined) Ionic 3

I am facing this problem when my project get a refresh every time io browser. Working good in Devices.

Log :

Error: Uncaught (in promise): undefined
    at c (http://localhost:8100/build/polyfills.js:3:19752)
    at c (http://localhost:8100/build/polyfills.js:3:19461)
    at http://localhost:8100/build/polyfills.js:3:20233
    at t.invokeTask (http://localhost:8100/build/polyfills.js:3:15660)
    at Object.onInvokeTask (http://localhost:8100/build/vendor.js:5099:33)
    at t.invokeTask (http://localhost:8100/build/polyfills.js:3:15581)
    at r.runTask (http://localhost:8100/build/polyfills.js:3:10834)
    at o (http://localhost:8100/build/polyfills.js:3:7894)
    at e.invokeTask [as invoke] (http://localhost:8100/build/polyfills.js:3:16823)
    at p (http://localhost:8100/build/polyfills.js:2:27648)

ionic info

cli packages: (/usr/local/lib/node_modules)

@ionic/cli-utils  : 1.19.2
ionic (Ionic CLI) : 3.20.0

global packages:

cordova (Cordova CLI) : 7.1.0 

local packages:

@ionic/app-scripts : 3.1.8
Cordova Platforms  : android 7.1.0
Ionic Framework    : ionic-angular 3.9.2


ios-deploy : 1.9.2 
Node       : v9.11.1
npm        : 6.0.1 
OS         : macOS High Sierra
Xcode      : Xcode 9.3.1 Build version 9E501 

Environment Variables:

ANDROID_HOME : not set


backend : pro

When I am using ionic lab command, every time my project refresh it’s got this error, Can anyone help me with that issue.
Thanks in Advance.

Any update here? Were you able to resolve?

Didn’t get any. Still same problem.