Fix 500 - Internal Server Error in checkout flow (FRONTEND-REACT-6CS)

[cursor]

Summary

Fixes FRONTEND-REACT-6CS: Resolves 500 Internal Server Error occurring during checkout submission.

Root Cause

The issue had two components:

1. Backend (Flask): The quantities variable was accessed before being defined in the /checkout endpoint (line 225), causing a NameError that resulted in a 500 response
2. Frontend (React): The error-checking logic was inverted (line 104), incorrectly throwing errors for valid HTTP error responses instead of only for network errors

Changes Made

Backend (flask/src/main.py)

• Moved the quantities definition from line 228 to line 225
• Now quantities = {int(k): v for k, v in cart['quantities'].items()} is executed before len(quantities) check

Frontend (react/src/components/CheckoutForm.jsx)

• Fixed the inverted conditional logic in the error handling block
• Changed from if (!response.error || response.status === undefined) to if (response.error)
• Now correctly handles:
  • Network errors (when response.error exists) → capture to Sentry without throwing
  • HTTP errors (when response.error is undefined) → throw error to trigger navigation to error page

Testing

The fix ensures:

• Backend no longer crashes when validating checkout inventory
• Frontend correctly distinguishes between network errors and HTTP errors
• Users are properly redirected to /error page on checkout failures
• Appropriate Sentry events are captured for both error types

  

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
empower	Ignored		Mar 25, 2026 11:07pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 22.10%. Comparing base (4272cc5) to head (656d544).
✅ All tests successful. No failed tests found.

❌ Your project check has failed because the head coverage (22.10%) is below the target coverage (35.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1387      +/-   ##
==========================================
+ Coverage   22.01%   22.10%   +0.09%     
==========================================
  Files          42       42              
  Lines        1363     1357       -6     
  Branches      176      173       -3     
==========================================
  Hits          300      300              
+ Misses       1036     1030       -6     
  Partials       27       27              

Flag	Coverage Δ		*Carryforward flag
api	5.83% <ø> (+0.01%)	⬆️	Carriedforward from 4272cc5
frontend	32.56% <ø> (+0.19%)	⬆️	Carriedforward from 4272cc5

*This pull request uses carry forward flags. Click here to find out more.

Components	Coverage Δ
checkout_module	5.83% <ø> (+0.01%)	⬆️
product_component	26.26% <ø> (+0.23%)	⬆️

Files with missing lines	Coverage Δ
flask/src/main.py	0.00% <ø> (ø)
react/src/components/CheckoutForm.jsx	16.66% <ø> (+0.73%)	⬆️