[#12021] - Sub Report Fill Error

When filling a sub report within a sub report .. not sure how to exactly reproduce, the attached error error occurs

I managed to fix this in
jasperserver-api-impl/engine/src/main/java/com/jaspersoft/jasperserver/api/engine/jasperreports/util/JRTimezoneJdbcQueryExecuter.java

Changing line 111 to
if (value != null && value.reportConnection != null && value.reportConnection.equals(reportConnection)) {

This adds checking if the value.reportConnection is null before calling equals.

ERROR JRFillSubreport,pool-5-thread-3:948 - Fill 1: exception
java.lang.NullPointerException
at com.jaspersoft.jasperserver.api.engine.jasperreports.util.JRTimezoneJdbcQueryExecuter.getTimezoneAdjustFromParent(JRTimezoneJdbcQueryExecuter.java:111)
at com.jaspersoft.jasperserver.api.engine.jasperreports.util.JRTimezoneJdbcQueryExecuter.<init>(JRTimezoneJdbcQueryExecuter.java:83)
at com.jaspersoft.jasperserver.api.engine.jasperreports.util.JRTimezoneJdbcQueryExecuterFactory.createQueryExecuter(JRTimezoneJdbcQueryExecuterFactory.java:51)
at net.sf.jasperreports.engine.query.QueryExecuterFactory.createQueryExecuter(QueryExecuterFactory.java:109)
at net.sf.jasperreports.engine.fill.JRFillDataset.createQueryDatasource(JRFillDataset.java:1254)
at net.sf.jasperreports.engine.fill.JRFillDataset.initDatasource(JRFillDataset.java:726)
at net.sf.jasperreports.engine.fill.BaseReportFiller.setParameters(BaseReportFiller.java:457)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:578)
at net.sf.jasperreports.engine.fill.BaseReportFiller.fill(BaseReportFiller.java:414)
at net.sf.jasperreports.engine.fill.JRFillSubreport.fillSubreport(JRFillSubreport.java:814)
at net.sf.jasperreports.engine.fill.JRSubreportRunnable.run(JRSubreportRunnable.java:61)
at net.sf.jasperreports.engine.fill.AbstractThreadSubreportRunner.run(AbstractThreadSubreportRunner.java:221)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)