nautechsystems/nautilus_trader · error

No session token for race stream

Error message

No session token for race stream

What it means

Error "No session token for race stream" thrown in nautechsystems/nautilus_trader.

Source

Thrown at crates/adapters/betfair/src/data.rs:697

            handler,
            self.stream_config.clone(),
        )
        .await
        .map_err(|e| anyhow::anyhow!("{e}"))?;

        self.stream_client = Some(Arc::new(stream_client));

        if self.config.subscribe_race_data {
            let race_config = BetfairStreamConfig {
                host: BETFAIR_RACE_STREAM_HOST.to_string(),
                ..self.stream_config.clone()
            };

            let race_session = self
                .http_client
                .session_token()
                .await
                .ok_or_else(|| anyhow::anyhow!("No session token for race stream"))?;

            let race_handler = Self::create_stream_handler(
                self.data_sender.clone(),
                Arc::clone(&self.instruments),
                self.currency,
                self.provider.min_notional(),
                reconnect_tx.clone(),
                self.clock,
            );

            let (race_fatal_tx, mut race_fatal_rx) = tokio::sync::mpsc::unbounded_channel();

            match BetfairRaceStreamClient::connect(
                &self.credential,
                race_session,
                race_handler,
                race_config,
                race_fatal_tx,

View on GitHub (pinned to a4b06ed870)

When it happens

Trigger: Thrown at crates/adapters/betfair/src/data.rs:697 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nautechsystems/nautilus_trader@a4b06ed870 (2026-08-16). Data as JSON: /api/errors/2726cf354e9878d5. Report an issue: GitHub.