Error on unmount if never opened

[rafeememon]

If the component is rendered into the DOM but never opened, the following error occurs because of calling ReactDOM.unmountComponentAtNode with a null node:

Uncaught Invariant Violation: unmountComponentAtNode(...): Target container is not a DOM element.

[halloffame]

I'm getting the same error, I tracked it down to this line:

https://github.com/souporserious/react-tether/blob/7fbbaad359c2916eedf6f78a88d2160059a98d49/src/TetherComponent.jsx#L78

ReactDOM.unmountComponentAtNode(this._elementParentNode)

In my case this._elementParentNode is null when it is trying to unmount, which is why it is throwing the error.