# 101002: Lock request already pending

Identifier: `lock_request_already_pending`



A lock could not be requested because a request for the same lock is already in progress. In Ably Spaces, a member may only have one outstanding request for a given lock at a time.

## What you should do

Wait for the pending [lock](https://ably.com/docs/spaces/locking.md) request to resolve before requesting the same lock again. A member can have only one outstanding request for a given lock, so let the first attempt succeed or fail rather than issuing another alongside it.

## Why it happens

A lock was requested while a request for the same lock by the same member was still in progress. Lock acquisition is asynchronous, and only one request per lock can be outstanding at a time.

## What you'll see

The error is reported with code 101002 and HTTP status 400. The message is `lock request already exists`.