Errors with switching tabs

[justin808]

Obscure error:
https://facebook.github.io/react/docs/error-decoder.html?invariant=32&args[]=23

Unable to find element with ID 23.

Reproduction:

1. Start app
2. Click on "Simple React" tab (or Classic Rails)
3. Click back on "React Router Demo" tab (or React Demo tab).
4. See error in console.

[justin808]

@richa Mentioned to me on Slack:

here is the culprit: richa@ac9af68
GitHub
removed stale App.cable code in CommentBox · richa/react-webpack-rails-tutorial@ac9af68
react-webpack-rails-tutorial - Example of integration of Rails, react, redux, using the react_on_rails gem, webpack, enabling the es7 and jsx transpilers, and node integration. And React Native! Live Demo:

Fix:
Need to remove this stale componentWillUnmount code last time

[kr7pt0]

I'm Oscar Endo. I'm grabbing this issue!

[kr7pt0]

I've a question.
In my local environment, I can't find this error. I pulled from master branch.
Do you have any idea?