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.

```js
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.
onClick={() => {
                handleNext1();
                setTimeout(handleNext2);
                setTimeout(() => {
                  handleNext3();
                });
              }}
            />
          );
        }
      `,
      errors: [
        {
          message:
            "The 'handleNext1' function makes the dependencies of useEffect Hook " +
            '(at line 15) change on every render. To fix this, wrap the ' +
            "definition of 'handleNext1' in its own useCallback() Hook.",
          suggestions: undefined,
        },
        {
          message:
            "The 'handleNext2' function makes the dependencies of useLayoutEffect Hook " +
            '(at line 19) change on every render. To fix this, wrap the ' +
            "definition of 'handleNext2' in its own useCallback() Hook.",
          
          
          suggestions: [
            {
              desc:
                "Wrap the definition of 'handleNext2' in its own useCallback() Hook.",