Avatar is shown after Back from Profile page

Precondition.
you should have registered user

Steps to reproduce:

1. Open forum main page as anonym.
2. Click at any nickname in last activity field (see an attachment).
3. At login dialog put your login and password and click "Sign In" button.
4. After user profile page opened, click "Back(navigation arrow)" button at browser navigation bar.

AR: unnecessary(waste) single page with user avatar opened.
ER: forum main page opened.