java.lang.NullPointerException: Inflater has been closed

Does somebody knows, what it means? It happens, when I try to upload a string at first time to my webserver. It only happen in release-mode, not in debug:

Code:

  2016-05-23 14:00:06.214:INFO::main: Logging initialized @878ms
2016-05-23 14:00:06.429:INFO:oejs.Server:main: jetty-9.3.z-SNAPSHOT
2016-05-23 14:00:06.474:INFO:oejsh.ContextHandler:main: Started...  

java.lang.NullPointerException: Inflater has been closed

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