This error may appear during instance shutdown. You may safely ignore this error, as it is raised only after the database has been closed. No action or corrective steps on the part of the DBA are required. The condition that causes this error to be raised is caught and handled starting in 18.104.22.168.
No patches available
Although the occasional appearance of this error on instance shutdown is messy and annoying, it is not harmful in any significant way. Accordingly, Oracle has provided no patch for this bug on any platform.