Cannot read property 'getWrappedInstance' of null when unmounting Chat component

[jramcast]

Uncaught TypeError: Cannot read property 'getWrappedInstance' of null
at Chat.saveHistoryRef (app.bundle.js:4408)
at detachRef (app.bundle.js:20390)
at Object.ReactRef.detachRefs (app.bundle.js:20445)
at Object.unmountComponent (app.bundle.js:4092)
at Object.unmountChildren (app.bundle.js:24781)
at ReactDOMComponent.unmountChildren (app.bundle.js:24554)
at ReactDOMComponent.unmountComponent (app.bundle.js:22872)
at Object.unmountComponent (app.bundle.js:4093)
at ReactCompositeComponentWrapper.unmountComponent (app.bundle.js:25211)
at Object.unmountComponent (app.bundle.js:4093)

I get this error when trying to unmount the React Chat component. The error occurs at the saveHistoryRef function because the passed historyWrapper is null:

Chat.prototype.saveHistoryRef = function (historyWrapper) {
        this.historyRef = historyWrapper.getWrappedInstance();
};

This simple code generates the error.

ReactDOM.render(
  <Chat
    directLine={{ secret: '...' }}
    user={{ id: 'agent1', name: 'agent1' }}
  />,
  document.getElementById('app')
 );

setTimeout(
  () => {
    ReactDOM.unmountComponentAtNode(document.getElementById('app'));
  },
  2000
);

Can we add a null check, like in #782 ?

[HernanCote]

Any news on this issue?

[eanders-ms]

@compulim Could you please have a look?

[compulim]

@HernanCote it's coming in PR #884.