Preconditions:

• Create user module

Steps to reproduce:

1. Configure create user module 
2. Send request to add user (user added).
3. Resend the same request once again (an error 500 occurs).

Actual result:

See attached screenshots.

An error 500 occurred while user is trying to create the same user name.

Expected result:

Correct response message appears e.g User with provided name already exist

Note:
As Ibexa Connect uses our Rest API, I think the same bug occurs on Rest API side.