after upgrade to 3.8.5; Looking up user profile from chat system gives error message.
 

After upgrading to version 3.8.5; an error message occurs when calling a user's profile from the chatbox:

'Your submission could not be processed because a security token was missing.'.

I have seen a lot of posts about same message for the 'mark post as read' script, but none for the chat.

How can I fix this?