Deleted global users can't create again

While global users are deleted via Browser UI, Deleted user can’t create again by using API.

Request response is { message: ‘failed to create user’ }.
Grafana Log;

t=2017-10-23T11:50:40+0000 lvl=eror msg=“failed to create user” logger=context userId=1 orgId=1 uname=admin error=“UNIQUE constraint failed: org.name

t=2017-10-23T11:50:40+0000 lvl=eror msg=“Request Completed” logger=context userId=1 orgId=1 uname=admin method=POST path=/api/admin/users status=500 remote_addr=172.20.0.1 time_ms=0 size=35 referer`=

Maybe you have auto create org enabled so the user has his org still there?

Thank you, for quick reply. I checked and yes the problem is “auto create org” but I have disabled that. Can you give me advice, how can I figure out?
My use configuration is below ;
Grafana   Home

I tried to create global users without assign to any org and faced the problem. Is there a way to create a user to a specific organization?