Application crashes when firebase.analytics(); is called from within an iframe in macOS Safari.

Regression of or otherwise related to #631 ?

import * as firebase from 'firebase/app';
import 'firebase/analytics';
const app = firebase.initializeApp({...);
const analytics = firebase.analytics();

• Operating System version: macOS Mojave
• Browser version: Safari 13.0.3
• Firebase SDK version: [email protected]
• Firebase Product: @firebase/[email protected]