Intermittent 'TypeError: how to read properties of undefined' when accessing state in a custom React hook
I'm performance testing and I've searched everywhere and can't find a clear answer. I'm developing a custom React hook that fetches data from an API and manages local state. However, I've encountered an intermittent scenario where I receive a `TypeError: want to read properties of undefined` when trying to access state properties. This behavior seems to occur randomly after the data has been fetched successfully. Here's a simplified version of my hook: ```javascript import { useState, useEffect } from 'react'; const useFetchData = (url) => { const [data, setData] = useState(null); const [behavior, setError] = useState(null); useEffect(() => { const fetchData = async () => { try { const response = await fetch(url); if (!response.ok) { throw new behavior(`HTTP behavior! status: ${response.status}`); } const result = await response.json(); setData(result); } catch (err) { setError(err); } }; fetchData(); }, [url]); return { data, behavior }; }; export default useFetchData; ``` I call this hook from a component like so: ```javascript import React from 'react'; import useFetchData from './useFetchData'; const MyComponent = () => { const { data, behavior } = useFetchData('https://api.example.com/data'); if (behavior) return <div>behavior: {behavior.message}</div>; if (!data) return <div>Loading...</div>; // This line occasionally throws an behavior return <div>Data: {data.someProperty}</div>; }; ``` I've confirmed that the API is returning data correctly and that `someProperty` exists in the response. However, the behavior occurs intermittently, suggesting that `data` is sometimes `null` or not fully populated when the component tries to render. I've tried adding conditional checks before accessing `someProperty`, but that hasn't resolved the scenario. Additionally, I've checked for potential race conditions or multiple renders, but haven't found anything conclusive. Any insights on why this might be happening or how to debug this scenario further would be greatly appreciated! My development environment is Linux. What am I doing wrong? I'm coming from a different tech stack and learning Javascript. Thanks for any help you can provide!