# 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.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.aurelia.io/developer-guides/error-messages/0203-to-0227/aur0225.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.