Chrome console - Uncaught (in promise) TypeError: this.engines is not iterable

Question

This error appears in chrome console when I load the app file on localhost:4200. I cannot figure out what does this point to. How do I find out the source of this error in my code?

Uncaught (in promise) TypeError: this.engines is not iterable
    at E.updateSocialMedia (content.js:48)
    at new E (content.js:48)
    at Function.start (content.js:48)
    at Function.main (content.js:48)

Answer 1

In my case McAfee chrome extension was causing the problem. McAfee extension

Uncaught (in promise) TypeError: this.engines is not iterable
    at E.updateSocialMedia (content.js:48)
    at new E (content.js:48)
    at Function.start (content.js:48)
    at Function.main (content.js:48)

When I disabled the extension, the problem was resolved.