---
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"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/50213#article
headline: "50213: Conflicting user modification"
url: https://www.twilio.com/docs/api/errors/50213
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 50213: Conflicting user modification

Log Type: APPLICATION

Log Level: ERROR

## 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.