async typeahead crashes when typing after overrideOptions is set to true

[ivarprudnikov]

The issue

What happens? -> React app crashes when user is typing into asyncTypeahead field with an option overrideOptions is set to true

Expected behavior: there should be no crash.

Example reproducing an issue: An example on codesandbox:

Example details

Otherwise this is what I used to reproduce:
package.json

{
  "dependencies": {
    "react": "16.10.2",
    "react-dom": "16.10.2",
    "react-bootstrap-typeahead": "3.1.4",
    "react-jsonschema-form": "1.8.0",
    "react-jsonschema-form-extras": "0.9.48",
    "react-scripts": "3.2.0"
  },
  "scripts": {
    "start": "react-scripts start"
  }
}

// React app
import React from "react";
import { render } from "react-dom";
import Form from "react-jsonschema-form";
import { AsyncTypeaheadField } from "react-jsonschema-form-extras/lib/TypeaheadField";

let schema = {
  type: "object",
  properties: {
    user: { type: "string" }
  }
};

const uiSchema = {
  user: {
    "ui:field": "asyncTypeahead",
    asyncTypeahead: {
      url: "https://jsonplaceholder.typicode.com/users",
      minLength: 1,
      labelKey: "username",
      overrideOptions: true
    }
  }
};

const App = () => (
  <Form
    schema={schema}
    uiSchema={uiSchema}
    fields={{ asyncTypeahead: AsyncTypeaheadField }}
    onChange={data => console.log("changed", data)}
    onSubmit={data => console.log("submitted", data)}
    onError={err => console.log("errors", err)}
  />
);

render(<App />, document.getElementById("root"));

Skipping index.html file here for brevity.

Crash details

After typing into the search box the app will crash with an error:

The above error occurred in the <TypeaheadContainer(WrappedTypeahead)> component:
    in TypeaheadContainer(WrappedTypeahead) (created by OnClickOutside(TypeaheadContainer(WrappedTypeahead)))
    in OnClickOutside(TypeaheadContainer(WrappedTypeahead)) (created by AsyncContainer(OnClickOutside(TypeaheadContainer(WrappedTypeahead))))
    in AsyncContainer(OnClickOutside(TypeaheadContainer(WrappedTypeahead))) (created by AsyncTypeaheadField)
    in div (created by AsyncTypeaheadField)
    in AsyncTypeaheadField (created by SchemaField
    in div (created by WrapIfAdditional)
    in WrapIfAdditional (created by DefaultTemplate)
    in DefaultTemplate (created by SchemaField)
    in SchemaField (created by ObjectField)
    in fieldset (created by DefaultObjectFieldTemplate)
    in DefaultObjectFieldTemplate (created by ObjectField)
    in ObjectField (created by SchemaField)
    in div (created by WrapIfAdditional)
    in WrapIfAdditional (created by DefaultTemplate)
    in DefaultTemplate (created by SchemaField)
    in SchemaField (created by Form)
    in form (created by Form)
    in Form (at src/index.js:31)
    in App (at src/index.js:42)

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