Administration page still marked as locked when closing Chrome window

When closing a Chrome window when on administration, the edit lock is not released.

Reproduction steps:

• Create an user with Admin rights
• With Admin user, on chrome, go to administration page
• Close the window
• When the other user you created, on firefox, go to administration page

Expected result:

• You can access to the administration without restriction

Obtained result:

• You obtain a warning because the page is Locked by Admin.