Language pack download: getOutputStream() has already been called for this response

[27565663] errors.GrailsExceptionResolver Exception occurred when processing request: [GET] /download/JIRA/6.4-m13-tac/ru_RU/JIRA-6.4-m13-tac-language-pack-ru_RU.jar
Stacktrace follows:

java.lang.IllegalStateException: getOutputStream() has already been called for this response
        at com.studentsonly.grails.plugins.uiperformance.CacheFilter.doFilter(CacheFilter.java:67)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)