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TypeError: Cannot read properties of undefined (reading 'email')
A null reference in checkout.service.ts:142 is causing payment failures for guest users. user?.email was removed in PR #1041, deployed 7 minutes before the first error.
Root cause
user?.email → user.email in PR #1041. Guest sessions pass undefined for user.
Suggested fix
- const email = user.email + const email = user?.email
checkout.service.ts · line 142
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Alex Chen
Active
@Bugfree what's causing the checkout errors right now?
Found 1 active critical incident — here's the full context:
TypeError: Cannot read properties of undefined
a3f9c21Root cause: checkout.service.ts:142 (optional chaining removed in PR #1041)
✅ verify-repro complete · 94% confidence · 6 repro steps
🎉 Incident resolved — post-mortem auto-posted to thread.
TypeError: Cannot read properties of undefined — critical · sentry · 14 occurrences
@Bugfree how do we stop this happening again?
Found 3 similar past incidents. Pattern: optional chaining removed during refactors. Recommend:
- •Null guards before nested props
- •Strict TS on payments module
- •Merge PR #1043 (already fixes crash)
Post-mortem #247
ResolvedAuto-generated · 3 action items · shared to #eng-payments
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