# Idempotency mismatch

URL: /code/api/errors/idempotency-mismatch · Id: `error:idempotency-mismatch`

> The idempotency key already names an Action with a different operation or input, so nothing runs.

The idempotency key already names an [Action](/business/nouns/action) with a different operation or input, so nothing runs.

| Property | Value |
| --- | --- |
| Type | `https://startupbuilder.dev/errors/idempotency-mismatch` |
| Status | `409` |
| Fix | Send a new idempotency key for the new request, or resend the original input to read the first Action. |
| Raised by | None. |