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TypeError: Cannot read properties of undefined
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TypeError: Cannot read properties of undefined (reading 'map')
  at renderUsers (src/components/UserList.tsx:24:18)
  at processChild (node_modules/react-dom/...)
  at finishClassComponent (node_modules/react-dom/...)
  at beginWork (node_modules/react-dom/...)

What happened

The users prop in UserList.tsx line 24 is undefined when the component first renders. The API call in the parent hasn't resolved yet, so users.map() fails because you can't call .map() on undefined.

Suggested Fix
// Line 24 — add optional chaining + fallback const list = (users ?? []).map(u => ( <UserCard key={u.id} user={u} /> ));
Time Travel

Execution timeline

1

Component mounts

UserList renders. users prop is undefined (parent state initializes as null).

T+0ms
2

Crash: users.map()

Cannot call .map() on undefined. React error boundary catches, but damage is done.

T+2ms
3

API resolves (too late)

The fetch in the parent component returns 47 users. But the component already crashed.

T+340ms
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