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React Component No Longer Renders After Cursor Refactoring

A React component that was previously rendering correctly now fails to display or shows blank/error states after Cursor refactored the component code.

The component may have missing state, incorrect hooks, or broken rendering logic.

Error Messages You Might See

React Hook "useState" is called conditionally Component is not a function Unexpected token < Cannot read property of undefined
React Hook "useState" is called conditionallyComponent is not a functionUnexpected token <Cannot read property of undefined

Common Causes

  1. useState or useEffect hook calls moved inside conditional logic (invalid hook rules)
  2. Required props no longer passed from parent after refactoring
  3. Component export changed to default export when named was needed
  4. useCallback/useMemo dependency arrays incomplete or removed
  5. Removed JSX return statement, leaving undefined return

How to Fix It

Verify hooks are at top level, not in conditionals. Check console for React errors and prop warnings. Ensure component is exported correctly. Add console.log() at render start. Verify all required props have default values or are properly passed.

Real developers can help you.

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Nam Tran Nam Tran 10 years as fullstack developer Sage Fulcher Sage Fulcher Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make peopleโ€™s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them) Luca Liberati Luca Liberati I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture Jacek Rozanski Jacek Rozanski Senior PHP/Symfony developer and DevOps engineer with 20+ years of professional experience, running opcode.pl (web development agency, est. 2004). Day job: I'm the sole backend developer at merketing company where I own and maintain 11 PHP/Symfony microservices on AWS (ECS Fargate, RDS, S3, CloudFront), handle the full CI/CD pipeline (Bitbucket Pipelines, Docker), and manage monitoring with Sentry and CloudWatch. These services handle high request volumes in production every month. What I bring to AI-built apps: - I audit and fix security issues (OWASP methodology), performance bottlenecks, and architectural problems in codebases generated by Cursor, Claude Code, Lovable, Bolt, and v0 - I refactor AI-generated prototypes into production-grade applications with proper error handling, testing, and clean architecture (SOLID, DDD, hexagonal architecture) - I set up the infrastructure AI tools don't touch: AWS hosting, CI/CD pipelines, automated deployments, database optimization, monitoring, and alerting - I integrate external services: payment providers, email systems, partner APIs, SSO/auth Tech stack: PHP 8.x, Symfony, React, Next.js, PostgreSQL, MySQL, Docker, AWS (ECS, RDS, S3, SQS/SNS, CloudFront), Terraform, Supabase. I also use AI tools daily (Claude Code, Cursor) in my own workflow, so I understand both the strengths and the gaps in AI-generated code. Based in Poland (CET timezone). Available for async work and calls during EU/US business hours. Bastien Labelle Bastien Labelle Full stack dev w/ 20+ years of experience hanson1014 hanson1014 Full-stack developer experienced in fixing and deploying AI-generated apps from Lovable, Bolt.new, Cursor, and Replit. I specialize in debugging Supabase integration issues (auth flows, RLS policies, database connections), fixing broken deployments, resolving routing/blank screen problems, and cleaning up messy React/Vite codebases. I also build production apps with the Claude API and have shipped a Mac desktop dev tool (Nexterm from scratch. Based in Hong Kong, fast turnaround.

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Frequently Asked Questions

What are React Hook rules?

Call hooks at top level, not in conditionals. Only call hooks from React functions. Use ESLint plugin to catch violations.

How do I debug React rendering?

Use React DevTools browser extension. Check console for warnings. Add console.log in render.

Related Cursor Issues

Can't fix it yourself?
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