Production Errors Fixed - VettCode AI Chat System

Date: August 14, 2026

Issues Identified from Production Logs

1. ❌ "No AI providers available" Error

Error:

Error: No AI providers available
at l.generateChat (/var/task/.next/server/chunks/121.js:80:7113)

Root Cause:

• The OPENROUTER_API_KEY and/or GROQ_API_KEY environment variables are not set in the Vercel production environment
• The AIProviderRegistry registers 0 providers when API keys are missing
• When getAvailableProviders() returns an empty array, the router throws "No AI providers available"

Fix Applied:

1. ✅ Added detailed logging to AIProviderRegistry.registerProviders() to show which providers are available
2. ✅ Added environment variable validation logging at startup
3. ✅ Enhanced error messages in ai-chat.ts to handle "No AI providers" gracefully
4. ✅ Falls back to template responses when no providers are available

User Impact:

• Before: Users saw technical error or app crash
• After: Users see template-based overview seamlessly (no error visible to user)

Action Required:

• Set OPENROUTER_API_KEY in Vercel environment variables
• Get key from: https://openrouter.ai/

---

2. ❌ Invalid MongoDB ObjectId Error

Error:

Failed to get user plan: BSONError: input must be a 24 character hex string, 12 byte Uint8Array, or an integer
at new ObjectId (/var/task/node_modules/bson/lib/bson.cjs:2538:23)
at n.findById (/var/task/.next/server/chunks/230.js:599:579)

Root Cause:

• getUserPlan() in subscription.ts was calling UserModel.findById(userId) without validating the userId format
• MongoDB ObjectIds must be exactly 24 hexadecimal characters
• Invalid userId formats (like session IDs or malformed strings) caused BSON errors

Fix Applied:

1. ✅ Added ObjectId format validation using regex: /^[0-9a-fA-F]{24}$/
2. ✅ Falls back to free plan if userId format is invalid
3. ✅ Added detailed logging to track invalid userIds
4. ✅ Graceful error handling that doesn't crash the request

Code:

// Validate ObjectId format before querying MongoDB
const objectIdRegex = /^[0-9a-fA-F]{24}$/;
if (!objectIdRegex.test(userId)) {
  console.warn(
    `[SUBSCRIPTION] Invalid ObjectId format: ${userId}. Falling back to free plan.`,
  );
  return SUBSCRIPTION_PLANS.free;
}

User Impact:

• Before: API requests failed with 500 error
• After: System gracefully handles invalid userIds and uses free plan

---

3. ✅ User-Friendly Error Messages

Improvement: Replaced technical error messages with user-friendly ones:

Code Location: lib/ai-chat.ts - generateChatResponse() catch block

---

4. ✅ Enhanced Logging for Debugging

Added comprehensive logging throughout the AI system:

Provider Registry:

[AI-PROVIDER-REGISTRY] Registering AI providers...
[AI-PROVIDER-REGISTRY] ✓ OpenRouter provider registered
[AI-PROVIDER-REGISTRY] ✗ Groq provider NOT available (missing GROQ_API_KEY)
[AI-PROVIDER-REGISTRY] Total providers registered: 1

Subscription System:

[SUBSCRIPTION] Invalid ObjectId format: abc123. Falling back to free plan.
[SUBSCRIPTION] User not found: 6a7c5c64c5b99e9b18e74414. Falling back to free plan.

AI Chat:

[AI-CHAT][req_123456] CRITICAL: No AI providers configured!
[AI-CHAT][req_123456] Chat response generation failed: No AI providers available

---

Verification Checklist

✅ Completed

• ObjectId validation in getUserPlan()
• User-friendly error messages in chat
• Provider registry logging
• Graceful fallback to templates
• Error classification by type

⚠️ Action Required (Deployment)

• Set OPENROUTER_API_KEY in Vercel environment variables
• Optionally set GROQ_API_KEY for backup provider
• Deploy changes to production
• Monitor logs for "[AI-PROVIDER-REGISTRY]" messages
• Verify AI chat works end-to-end

---

Testing Instructions

Local Testing

# Test with no API keys (should use templates)
unset OPENROUTER_API_KEY
unset GROQ_API_KEY
npm run dev

# Visit /dashboard/scans/[scanId]/ai
# Should see template overview (not error)

Production Testing

1. Deploy to Vercel
2. Check build logs for provider registration messages
3. Open AI chat page
4. Verify either:
   • AI responses work (if keys are set)
   • Template responses work (if keys are missing)
   • No crashes or 500 errors in either case

---

Files Modified

1. lib/subscription.ts

   • Added ObjectId validation
   • Enhanced error logging
   • Graceful fallback handling

2. lib/ai-chat.ts

   • User-friendly error messages
   • Error type classification
   • Better logging throughout

3. lib/ai-providers.ts

   • Provider registry logging
   • Environment variable diagnostics
   • Startup validation

---

Environment Variables Required

# Required for AI chat to work
OPENROUTER_API_KEY=sk-or-v1-xxxxxxxxxxxxx

# Optional backup provider
GROQ_API_KEY=gsk_xxxxxxxxxxxxx

# MongoDB connection (ensure it's valid)
MONGODB_URI=mongodb+srv://user:pass@cluster.mongodb.net/vettcode

# NextAuth (for user sessions)
NEXTAUTH_SECRET=your_secret_min_32_chars
NEXTAUTH_URL=https://vettedcodewe.vercel.app

---

Next Steps

1. Immediate:

   • Set OPENROUTER_API_KEY in Vercel project settings
   • Redeploy to production
   • Test AI chat functionality

2. Monitoring:

   • Watch production logs for "[AI-PROVIDER-REGISTRY]" on startup
   • Monitor "[SUBSCRIPTION]" logs for invalid ObjectIds
   • Track error rates in AI chat

3. Future Improvements:

   • Add server-side request deduplication (prevent duplicate AI calls)
   • Implement retry button UI for failed AI requests
   • Add usage analytics dashboard

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Related Documentation

• docs/AI_CHAT_FIXES_SUMMARY.md - Complete implementation history
• docs/AI_IMPLEMENTATION_GUIDE.md - AI system architecture
• .env.example - All required environment variables