When edit "Account"/ "User", login field data is "blanked"

As decribed, but all context and story:
I am implementing traccar for my enterprise. I need login with "login" field in "Users" table, and store a valid email in "email" field, to send email reports.
When i edit an user, from admin session, email data is overwritten by login field data, and login field data is blanked.
Before modify:

After modify:

After that, i edit traccar.xml file, adding this entry:

        SELECT * FROM tc_users
        WHERE login = :email
    </entry>```

and this solve my problem (apparently): I edit whatever user, and no email overwritten, and no login blanked.

But, when I enter to "Account" or "Users" and modify my own account,
![Menu](https://user-images.githubusercontent.com/66650830/84092729-e854b500-a9bd-11ea-8b04-f9df5b021da9.png)
login data is "blanked", and email is preserved, and this is a big problem with data consistency, because this traccar users are logining by login, not email:
![login](https://user-images.githubusercontent.com/66650830/84091660-b7bf4c00-a9ba-11ea-93fb-6f0d5bf44ad9.png)

I've search throuhgout forums but no similar info to help me fix the problem, only references about LDAP integration, but my traccar isn't with it, so I think is convenient handle this as an important bug, unless a fix or solutions already exists.

Thanks a lot.

What happens if you do following:

1. Manually set "login" in the database
2. Restart Traccar service
3. Edit email from the web app

Does the login get cleared?

Now, login was not cleared after restart Traccar service and editing email.

There was a a problem with my database consistency, because of manual setting in the table?

Yes, Traccar has internal cache which is not updated when you manually edit database.

Ok, i never did a traccar service restart on my previous tests.

Thank you again.