java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at hudson.plugins.perforce.PerforceSCM.getDefaultSubstitutions(PerforceSCM.java:394)
at hudson.plugins.perforce.PerforceSCM.pollChanges(PerforceSCM.java:702)
at hudson.scm.SCM.poll(SCM.java:370)
at hudson.model.AbstractProject.poll(AbstractProject.java:1157)
at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:330)
at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:359)
at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
at java.util.concurrent.FutureTask.run(FutureTask.java:123)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)

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