qianye1001 opened a new issue, #9128: URL: https://github.com/apache/rocketmq/issues/9128
### Before Creating the Bug Report - [x] I found a bug, not just asking a question, which should be created in [GitHub Discussions](https://github.com/apache/rocketmq/discussions). - [x] I have searched the [GitHub Issues](https://github.com/apache/rocketmq/issues) and [GitHub Discussions](https://github.com/apache/rocketmq/discussions) of this repository and believe that this is not a duplicate. - [x] I have confirmed that this bug belongs to the current repository, not other repositories of RocketMQ. ### Runtime platform environment any ### RocketMQ version develop branch ### JDK Version any ### Describe the Bug When a client changes its proxy, the client's heartbeat might arrive later than other requests, causing a NullPointerException (NPE) when executing getHandleString during acknowledgment (ack). ### Steps to Reproduce 1. receive some messages from proxy1 2. Shutdown proxy1 3. ack messages ### What Did You Expect to See? ack successfully ### What Did You See Instead? npe ### Additional Context _No response_ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@rocketmq.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
