An error on report execution canceling (Cancel doesn't work)

[sergey.vishnevetskiy]

When you cancel report execution you'll get server error message, but really no error occured and it's confusing for end user. The question is - how to disable error message after report cancelling?

Error log

2018-03-12 09:20:46,735 ERROR ErrorPageHandlerAction,http-bio-8080-exec-5:118 - Error UID 0b946252-bbfe-48cc-82f9-a2131ceb720b
java.lang.NullPointerException
    at com.jaspersoft.webservice.data.query.WebServiceQueryExecuter.getInternalQE(WebServiceQueryExecuter.java:243)
    at com.jaspersoft.webservice.data.query.WebServiceQueryExecuter.cancelQuery(WebServiceQueryExecuter.java:215)
    at net.sf.jasperreports.engine.fill.JRFillContext.cancelRunningQuery(JRFillContext.java:352)
    at net.sf.jasperreports.engine.fill.BaseReportFiller.cancelFill(BaseReportFiller.java:735)
    at net.sf.jasperreports.engine.fill.BaseFillHandle.cancellFill(BaseFillHandle.java:185)
    at com.jaspersoft.jasperserver.api.engine.jasperreports.service.impl.EngineServiceImpl$FillHandleCancelable.cancel(EngineServiceImpl.java:1176)
    at com.jaspersoft.jasperserver.api.engine.jasperreports.service.impl.EngineServiceImpl$ReportExecutionStatus.cancel(EngineServiceImpl.java:1257)
    at com.jaspersoft.jasperserver.api.engine.jasperreports.service.impl.EngineServiceImpl.cancelExecution(EngineServiceImpl.java:1354)
    at com.jaspersoft.jasperserver.war.action.ReportExecutionController.viewReportCancel(ReportExecutionController.java:144)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

UPD: Data Source - WebServiceQuery

UPD 1: Definetly have something to do with data source. If change it from WebServiceQuery - works fine.

UPD2: Even more interesting - cancel really doesn't work. Because if you'll wait enough for execution time after pressing cancel you'll see the report undeneath the error message. And you'll have the opportunity to work with it as normal...