<!--
order: 0
title: Crisis Overview
parent:
title: "crisis"
-->
# `crisis`
## Overview
The crisis module halts the blockchain under the circumstance that a blockchain
invariant is broken. Invariants can be registered with the application during the
application initialization process.
## Contents
1. **[State](01_state.md)**
- [ConstantFee](01_state.md#constantfee)
2. **[Messages](02_messages.md)**
- [MsgVerifyInvariant](02_messages.md#msgverifyinvariant)
3. **[Events](03_events.md)**
- [Handlers](03_events.md#handlers)
4. **[Parameters](04_params.md)**
5. **[Client](05_client.md)**
- [CLI](05_client.md#cli)
