Browser or terminal
TypeError: Cannot read properties of undefined (reading '…')
- What it means
- The code tried to read a field inside an item that is empty (`undefined`) instead of checking if it exists first.
- Likely causes
- Data from the database or an API hasn't loaded yet, or returned no matching record.
- A component prop was renamed or forgotten when rendering the component.
- Prevention
- Always handle empty states (such as no items yet or a signed-out visitor) in every screen.
Copy for your agent
I get `TypeError: Cannot read properties of undefined`. Find the line from the stack trace, handle the empty case safely, and add a test for when that value is missing.
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