Description
On a broker recently upgraded to 5.16.1, I've seen the following warning:
2021-02-03 16:21:00,745 [ActiveMQ NIO Worker 9] WARN ProtocolConverter - Exception occurred for client null (null) processing: SEND -> org.apache.activemq.transport.stomp.ProtocolException: Not connected.
This looks a lot like AMQ-7444.
If possible, it would be good to log client IP information for this warning too.