Reproduce:

• Goto any protected page
• Let session expire (or delete your credential cookies and localstorage)
• Navigate to another protected page

Expected:

• I get redirected to login page without warnings in browser console

Observed:

• Warning about setting setState on an unmounted component (Footer)

Hint:
The Footer component is mounted when the new protected page is accessed. The Footer makes a query for the connection status. Before the query response arrives, the Footer is unmounted again for the login page