Gulp Bundle Issue Cannot Read Property Id Of Undefined

SPFX react sur Internet explorer : [SPLoaderError.loadComponentError]: There was a network problem. This may be a problem with a HTTPS certificate. Make sure you have the right certificate.

It's not always à certificate error, in my case, i use code below in a service,

import 'core-js/modules/es6.string.includes.js';//in my case this line should be commented to fix the isssue
import 'core-js/modules/es6.number.is-nan.js';
import 'core-js/es6/array';
import 'es6-map/implement';

when including "@types/es6-promise": "^3.3.0" i don't need anymore import 'core-js/modules/es6.string.includes.js

Sharepoint missing icon on SPFX developpements

Some ican can be missing per exemple on :

SPFX missing icon as <i data-icon-name="Tag" class="ms-Button-icon icon-167" role="presentation" aria-hidden="true"></i> 

So you simply have to add this code below after yours imports

import { initializeIcons } from 'office-ui-fabric-react/lib/Icons';

initializeIcons();