# signal_in_flight

> Signal webhook: this alert is still being handled by an earlier delivery.

Source: https://tickwire.io/docs/errors/signal_in_flight/

HTTP 409. Unknown: it may have executed. Resolve it with the same idempotency key before acting.

**Likely cause:** TradingView, or your own sender, sent the same alert twice at once.

**What to do:** Send the same alert again (same alert_id, or the same body) after Retry-After to get its result. Do not send it as a new alert: its orders may execute.

**Retry:** Only with the same `Idempotency-Key` (or `clientId`). The first attempt may have executed; never resend a trade blindly.

Listed under [Signal webhooks (TradingView)](https://tickwire.io/docs/errors/#signal-webhooks-tradingview) in [Errors](https://tickwire.io/docs/errors/). Send the error's `requestId` to support and we can find the request.