NullPointerException with "utput Every" & "for discrete_delivery" when no output is available

NullPointerException in com.espertech.esper.core.service.StatementResultServiceImpl.processDispatch(UniformPair<EventBean[]> events)

• Line 252.

For query
SELECT Anything FROM AnyStream
OUTPUT ALL EVERY 2 seconds
for discrete_delivery

No error when:

• "for discrete_delivery" is removed
• when there Is some output
• before some event is inserted into the stream - even one

See line 252 in
com.espertech.esper.core.service.StatementResultServiceImpl.processDispatch(UniformPair<EventBean[]> events)
"events" is null
"event" should probably be an empty array instead?
So perhaps error is in com.espertech.esper.event.EventBeanUtility.UniformPair<EventBean[]> flattenList(ArrayDeque<UniformPair<EventBean[]>> eventVector)
??

ERROR com.espertech.esper.timer.EPLTimerTask - Timer thread caught unhandled exception: java.lang.NullPointerException
com.espertech.esper.client.EPException: java.lang.NullPointerException
at com.espertech.esper.core.service.EPRuntimeImpl.dispatch(EPRuntimeImpl.java:1221)
at com.espertech.esper.core.service.EPRuntimeImpl.processTimeEvent(EPRuntimeImpl.java:519)
at com.espertech.esper.core.service.EPRuntimeImpl.processEvent(EPRuntimeImpl.java:413)
at com.espertech.esper.core.service.EPRuntimeImpl.sendEvent(EPRuntimeImpl.java:240)
at com.espertech.esper.core.service.EPRuntimeImpl.timerCallback(EPRuntimeImpl.java:214)
at com.espertech.esper.timer.EPLTimerTask.run(EPLTimerTask.java:61)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source)
at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at com.espertech.esper.core.service.StatementResultServiceImpl.processDispatch(StatementResultServiceImpl.java:252)
at com.espertech.esper.core.service.StatementResultServiceImpl.execute(StatementResultServiceImpl.java:231)
at com.espertech.esper.core.service.UpdateDispatchViewBase.execute(UpdateDispatchViewBase.java:75)
at com.espertech.esper.core.service.UpdateDispatchFutureSpin.execute(UpdateDispatchFutureSpin.java:85)
at com.espertech.esper.dispatch.DispatchServiceImpl.dispatchFromQueue(DispatchServiceImpl.java:52)
at com.espertech.esper.dispatch.DispatchServiceImpl.dispatch(DispatchServiceImpl.java:31)
at com.espertech.esper.core.service.EPRuntimeImpl.dispatch(EPRuntimeImpl.java:1217)
... 13 more