When we're building our Angular SPA for localhost it works perfectly.

On our dev environment, this error creeps into the DevTool console and breaks everything:
ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'digest' of undefined

```
TypeError: Cannot read property 'digest' of undefined
    at N (auth0-spa-js.production.js:1)
    at ie.<anonymous> (auth0-spa-js.production.js:1)
    at Generator.next (<anonymous>)
    at auth0-spa-js.production.js:1
    at new ZoneAwarePromise (zone-evergreen.js:876)
    at t (auth0-spa-js.production.js:1)
    at ie.loginWithRedirect (auth0-spa-js.production.js:1)
    at AuthGuard.<anonymous> (auth.guard.ts:22)
    at Generator.next (<anonymous>)
    at fulfilled (environment.ts:11)
    at resolvePromise (zone-evergreen.js:797)
    at new ZoneAwarePromise (zone-evergreen.js:879)
    at t (auth0-spa-js.production.js:1)
    at ie.loginWithRedirect (auth0-spa-js.production.js:1)
    at AuthGuard.<anonymous> (auth.guard.ts:22)
    at Generator.next (<anonymous>)
    at fulfilled (environment.ts:11)
    at ZoneDelegate.invoke (zone-evergreen.js:359)
    at Object.onInvoke (core.js:34195)
    at ZoneDelegate.invoke (zone-evergreen.js:358)

```

I guess it must be something about the build process, some different flags, but I can't figure out exactly which.