CF2016: large number of NullPointerExceptions at intervals

We upgraded from CF9 to CF2016 a couple of weeks ago.

The following issue seems to occur every few days.  When it occurs, there are large numbers of exceptions at exactly the same instant.   There were *47* of these NullPointerExceptions in our exception.log this morning:

"Error","scheduler-2","08/03/17","05:11:14","","'' The specific sequence of files included or processed is: '''' "

java.lang.NullPointerException

        at coldfusion.runtime.NeoJspWriter.writeOutput(NeoJspWriter.java:228)

        at coldfusion.runtime.NeoJspWriter.flush(NeoJspWriter.java:362)

        at coldfusion.cfc.CFCProxy.flush(CFCProxy.java:357)

        at coldfusion.cfc.CFCProxy.doInvoke(CFCProxy.java:332)

        at coldfusion.cfc.CFCProxy.invoke(CFCProxy.java:302)

        at coldfusion.runtime.AppEventInvoker.onSessionEnd(AppEventInvoker.java:462)

        at coldfusion.runtime.SessionTracker.invokeOnSessinEnd(SessionTracker.java:292)

        at coldfusion.runtime.SessionTracker.cleanUp(SessionTracker.java:275)

        at coldfusion.runtime.SessionTracker.access$000(SessionTracker.java:43)

        at coldfusion.runtime.SessionTracker$SessionCleanUpAgent.run(SessionTracker.java:484)

        at coldfusion.scheduling.ThreadPool.run(ThreadPool.java:260)

        at coldfusion.scheduling.WorkerThread.run(WorkerThread.java:71)

The application.log:

"Error","scheduler-2","08/03/17","05:11:14","","'' The specific sequence of files included or processed is: '''' "

"Error","scheduler-2","08/03/17","05:11:14","","'' The specific sequence of files included or processed is: '''' "

"Error","scheduler-2","08/03/17","05:11:14","","'' The specific sequence of files included or processed is: '''' "

"Error","scheduler-2","08/03/17","05:11:14","","'' The specific sequence of files included or processed is: '''' "

"Error","scheduler-2","08/03/17","05:11:14","","'' The specific sequence of files included or processed is: '''' "

"Error","scheduler-2","08/03/17","05:11:14","","'' The specific sequence of files included or processed is: '''' "

"Error","scheduler-2","08/03/17","05:11:14","","'' The specific sequence of files included or processed is: '''' "

...

Please investigate CF team.  What is going on here?  Why are we getting these exceptions?   What damage are they causing?

CF2016, RedHat7, Apache 2.4, everything patched and current.

Thanks