nautechsystems/nautilus_trader · error · anyhow::Error

Cannot extract condition_id from symbol '{symbol}': no '-' s

Error message

Cannot extract condition_id from symbol '{symbol}': no '-' separator

What it means

Polymarket instrument symbols follow the pattern {condition_id}-{token_id}. extract_condition_id splits the symbol at the last '-' and returns everything before it; this error is thrown when the symbol contains no '-' separator at all, so a condition_id cannot be recovered.

Source

Thrown at crates/adapters/polymarket/src/providers.rs:591

        series_id: Some(series_ids),
        active: Some(true),
        closed: Some(false),
        ..Default::default()
    }
}

/// Extracts the condition ID from an instrument symbol.
///
/// Polymarket instrument symbols follow the pattern `{condition_id}-{token_id}`.
/// The condition_id is a hex string (e.g. `0xabc123...`) and the token_id is a
/// large decimal number. This extracts the condition_id by splitting at the last `-`.
pub fn extract_condition_id(instrument_id: &InstrumentId) -> anyhow::Result<String> {
    let symbol = instrument_id.symbol.as_str();
    symbol
        .rfind('-')
        .map(|idx| symbol[..idx].to_string())
        .ok_or_else(|| {
            anyhow::anyhow!("Cannot extract condition_id from symbol '{symbol}': no '-' separator")
        })
}

/// Extracts the token ID from an instrument symbol.
///
/// Polymarket instrument symbols follow the pattern `{condition_id}-{token_id}`. This extracts the
/// token_id by splitting at the last `-`.
pub(crate) fn extract_token_id(instrument_id: &InstrumentId) -> anyhow::Result<String> {
    let symbol = instrument_id.symbol.as_str();
    symbol
        .rsplit_once('-')
        .map(|(_, token_id)| token_id.to_string())
        .ok_or_else(|| {
            anyhow::anyhow!("Cannot extract token_id from symbol '{symbol}': no '-' separator")
        })
}

/// Builds validated market keyset parameters from string key/value filters.

View on GitHub (pinned to 18893faf8b)

Solutions

1. Ensure the InstrumentId was created from a Polymarket instrument definition so the symbol is {condition_id}-{token_id}.
2. Validate the symbol contains '-' before calling extract_condition_id.
3. Check where the InstrumentId originates — a non-Polymarket instrument is likely being routed into Polymarket provider logic.

Example fix

// before
let condition_id = extract_condition_id(&instrument_id)?;
// after
if !instrument_id.symbol.as_str().contains('-') {
    anyhow::bail!("not a Polymarket symbol: {}", instrument_id.symbol);
}
let condition_id = extract_condition_id(&instrument_id)?;

fn symbol_has_condition_id(instrument_id: &InstrumentId) -> bool {
    instrument_id.symbol.as_str().contains('-')
}

fn split_polymarket_symbol(symbol: &str) -> Option<(String, String)> {
    symbol.rsplit_once('-').map(|(c, t)| (c.to_string(), t.to_string()))
}

match extract_condition_id(&instrument_id) {
    Ok(cid) => cid,
    Err(e) => { debug!("not a Polymarket symbol: {e}"); return Ok(()); }
}

When it happens

Trigger: Calling extract_condition_id (directly or via resume_resolution_subscriptions, queue_pending_load, ensure_auto_load_task, etc.) with an InstrumentId whose symbol lacks a '-', e.g. a manually constructed symbol or one from a different adapter's naming convention.

Common situations: Hardcoded or test instrument ids not built via the Polymarket instrument factory, symbols from other venues leaking into Polymarket subscription code, or truncated symbol strings.

Understand the failure class

Background: "invalid id" errors: invalid identifier format — why libraries reject IDs before lookup, and how to fix them — this error's family across 37 libraries.

Related errors

• Cannot extract token_id from symbol '{symbol}': no '-' separ
• invalid signed E18 integer for {field}: {value}
• Empty book snapshot for {instrument_id}
• Failed to parse clob_token_ids '{}': {e}
• Failed to parse outcomes '{}': {e}

AI-assisted analysis of nautechsystems/nautilus_trader@18893faf8b (2026-09-08). Data as JSON: /api/errors/51ad9f9d16252eff. Report an issue: GitHub.