Diagnose NullPointerException in SCM polling

[Ken O]

I'm having an issue with an NPE occurring when Jenkins attempts to perform an SCM poll for any job.  SCM checkout from SourceGear Vault seems to work correctly when I manually kick off a build.  Could someone provide guidance on how to further investigate the cause?

Environment:  Jenkins 1.596, JRE 8.0.250, SourceGear Vault SCM Plugin v1.1.1, SourceGear Vault Pro 6.0.1, Win7

SCM Polling Log:

Polling SCM changes on master
ERROR

ERROR: Failed to record SCM polling for hudson.model.FreeStyleProject@149cef1[FAB22_FABMain]

java.lang.NullPointerException

        at org.jvnet.hudson.plugins.VaultSCM.getVaultPath(VaultSCM.java:334)

        at org.jvnet.hudson.plugins.VaultSCM.determineChangeCount(VaultSCM.java:521)

        at org.jvnet.hudson.plugins.VaultSCM.compareRemoteRevisionWith(VaultSCM.java:293)

        at hudson.scm.SCM.poll(SCM.java:397)

        at hudson.model.AbstractProject.pollWithWorkspace(AbstractProject.java:1462)

        at hudson.model.AbstractProject._poll(AbstractProject.java:1433)

        at hudson.model.AbstractProject.poll(AbstractProject.java:1344)

        at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:515)

        at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:544)

        at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)

        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)

        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)

        at java.util.concurrent.FutureTask.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)

[Ken O]

I have entered a ticket for this issue and reported additional info after running the VaultSCM plugin in the debugger.  I now know the cause of the NPE, but not sure yet how to address it.