# Underflow (/docs/errors/chain/Underflow)

A checked subtraction underflowed in crowdloan accounting, e.g. `raised` exceeding `cap` when computing remaining room, or a contributor count decrement, indicating inconsistent state. Inspect the `Crowdloans` and `Contributions` entries for the `crowdloan_id`.

Declared by the `Crowdloan` pallet; it classifies to the semantic code [`internal`](/docs/errors/internal).

## Remediation [#remediation]

A chain-side invariant failed; nothing to fix client-side — report it if it persists

The same explanation is available in the terminal: `btcli explain Underflow`.