---
page_type: error
code: 50213
message: "50213: Conflicting user modification"
level: ERROR
product: Programmable Chat
---

## Description

The requested user is already being added or removed from this service instance concurrently with another API request. The last request will be rejected to avoid inconsistent state.

### Possible Causes

- You might be adding a new user to the service instance while the user with the same identity is being removed from another thread.
- You might be submitting multiple concurrent requests to add a user with the same identity to the service instance.
- You might be submitting multiple concurrent requests to delete the same user by SID or identity from the service instance.

### Possible Solutions

- Implement an operation retrier and repeat the failed user API requests after an interval of time, using an exponential backoff algorithm.
- Review your application logic that caused the race condition when adding or removing users. Perhaps the conflicting operations are happening in a loop that could be avoided.