# AUR0225

## Error Message

`AUR0225: Trying to stop an effect that has already been stopped`

## Description

This error occurs when Aurelia’s effect system is asked to stop an effect more than once.

## Common Scenarios

* Stopping an effect in both `unbinding` and `detached` (or multiple lifecycle hooks).
* Retaining a stale effect reference and stopping it again.

## Solution

* Ensure you stop effects exactly once.
* Clear/overwrite stored effect references after stopping them.