Exception occurred when processing request: [POST] /translation/verify

[351078152] errors.GrailsExceptionResolver Exception occurred when processing request: [POST] /translation/verify
Stacktrace follows:
org.codehaus.groovy.grails.web.servlet.mvc.exceptions.ControllerExecutionException: Executing action [verifyTranslation] of controller [translate.TranslationController]  caused exception: Assertion failed:

assert original != null
       |        |
       null     false

        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)
Caused by: org.codehaus.groovy.runtime.InvokerInvocationException: Assertion failed:

assert original != null
       |        |
       null     false

        ... 4 more
Caused by: Assertion failed:

assert original != null
       |        |
       null     false

        at translate.TranslationController$_closure1.doCall(TranslationController.groovy:13)
        at translate.TranslationController$_closure1.doCall(TranslationController.groovy)
        ... 4 more