# Duplicate Side Effects

> Reprocessing a message so its side effects run more than once, corrupting state when not idempotent.

Record: `lex:duplicate-side-effects`
Kind: anti-pattern
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lex-duplicate-side-effects

## category

- [Event Messaging Async](https://banes-lab.com/records/lex-category/event-messaging-async.md)

## referenced-by

- [Idempotent Consumer](https://banes-lab.com/records/arch/idempotent-consumer.md)