eslint-plugin-react-hooks version: 4.2.0

Steps To Reproduce

I know it shouldn't exist in production code, but it's annoying while editing some files.

import React, { useEffect } from "react";

const App = () => {
  useEffect(); // <-
  return null;
};

export default App;

Link to code example: https://codesandbox.io/s/polished-sun-3wr27?file=/src/App.js

The current behavior

ESLint crashed.

TypeError: Cannot read property 'type' of undefined

The expected behavior

ESLint doesn't crash but reports an error instead.