Bug during login


Hello everyone!
I try to schematize the problem:
a child A logs in to his class 5; the child A forgets to log out and closes the browser window.
Another child B uses the same computer to log in to his class 4, which occurred Access successfully, it really happens that the child A to be found recorded in the 4!!!
Could you please solve the problem?
Thank you


Please report this as a but to support@code.org. Thanks