# state_key_duplicate

## What happened

A second stored signal was created for the key while the first is live; each writes its own value and neither hears the other, since the storage event tells other tabs alone.

## What to do

Create a stored signal once per key, at module level or in the app's root, and share it; one created inside a component goes with the component, so create the next after that one is disposed.

The arguments of the specific occurrence are in the query string of the URL the error gave you.