Prevent the own user to delete it's account

Hi,

In administrators, i mean creating users, it should not be possible to delete the user that i'm logged on.

Ex: If i logged in via "admin", it should be able to delete that account, while i'm logged with it. Imagine that I just have that user in the system, and i delete it, the system stays without any user to login.

 

Also, the delete action, should have a confirmation box, like in addressbook, if possible of course.