Fix 'Undefined Is Not a Function'

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# Bug
I get "TypeError: [function] is not a function" when I [action, e.g. click Save].

## Context
- Framework: [framework, e.g. React 18]
- Stack trace:
[Paste stack trace here]
- Relevant code:
[Paste the function and where it is called]

## What I need
1. Explain the root cause in two sentences.
2. Give the smallest code change that fixes it.
3. Tell me how to confirm the fix.

## Rules
- Do not rewrite unrelated code.
- If you need more context, ask before guessing.

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