hudson.triggers.Trigger$Cron doRun throwing a NullPointerException

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      Hi, it seems that Jenkins is throwing a NullPointerException on the below in the background logs but i can't seem to tell why.

      Jun 25, 2015 5:38:00 PM hudson.triggers.Trigger$Cron doRun
WARNING: Cron thread throw an exception
java.lang.NullPointerException
        at hudson.model.Descriptor.toMap(Descriptor.java:880)
        at hudson.util.DescribableList.toMap(DescribableList.java:151)
        at hudson.model.AbstractProject.getTriggers(AbstractProject.java:1615)
        at hudson.triggers.Trigger.checkTriggers(Trigger.java:259)
        at hudson.triggers.Trigger$Cron.doRun(Trigger.java:215)
        at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:51)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)

        1. Untitled spreadsheet - Sheet1 (1).pdf
          8 kB
          gene lzr
        2. Untitled spreadsheet - Sheet2.pdf
          3 kB
          gene lzr

            Assignee:
            Unassigned
            Reporter:
            Chin Boon Oh
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Archived: