Logs contain many "o.a.coyote.http11.Http11NioProtocol Error reading request, ignored" errors

Issue Summary

The Bitbucket application logs (atlassian-bitbucket.log) contain a significant amount of lines like the following:

ERROR [https-jsse-nio-8201-exec-133]  o.a.coyote.http11.Http11NioProtocol Error reading request, ignored
java.lang.NullPointerException: null
at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.getSslSupport(NioEndpoint.java:1392)

While this does not represent any particular issue with Bitbucket, it causes the log size to be significantly higher than usual and makes the logs harder to process for any potential issue investigation.

This problem is cause

Steps to Reproduce

No particular steps are needed, having Bitbucket running will cause this.

Expected Results

No errors are logged unless an actual problem is occurring.

Actual Results

The below exception is thrown in the atlassian-bitbucket.log file:

ERROR [https-jsse-nio-8201-exec-133]  o.a.coyote.http11.Http11NioProtocol Error reading request, ignored
java.lang.NullPointerException: null
at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.getSslSupport(NioEndpoint.java:1392)

Workaround

If an upgrade is not possible, an option is to change the log level by setting the following in the bitbucket.properties and restart each node:
logging.logger.org.apache.coyote.http11.Http11NioProtocol=FATAL

However, this may hide other important errors.