Github user weand commented on the issue:

    https://github.com/apache/zeppelin/pull/2914
  
    not directly when logged out. instead the NPE happens when Zeppelin gets 
restartet and next cron runs before the note was run manually, which is a 
frequent use case IMHO.
    > ERROR [2018-04-12 21:11:00,024] ({DefaultQuartzScheduler_Worker-1} 
QuartzScheduler.java[schedulerError]:2425) - Job (note.2DBFZ9GGT threw an 
exception.
    org.quartz.SchedulerException: Job threw an unhandled exception. [See 
nested exception: java.lang.NullPointerException: while trying to invoke the 
method org.apache.zeppelin.user.AuthenticationInfo.getUser() of a null object 
loaded from local variable 'authenticationInfo']
        at org.quartz.core.JobRunShell.run(JobRunShell.java:213)
        at 
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
    Caused by: java.lang.NullPointerException: while trying to invoke the 
method org.apache.zeppelin.user.AuthenticationInfo.getUser() of a null object 
loaded from local variable 'authenticationInfo'
        at 
org.apache.zeppelin.notebook.Paragraph.setAuthenticationInfo(Paragraph.java:209)
        at org.apache.zeppelin.notebook.Paragraph.execute(Paragraph.java:353)
        at org.apache.zeppelin.notebook.Note.run(Note.java:678)
        at org.apache.zeppelin.notebook.Note.runAll(Note.java:659)
        at org.apache.zeppelin.notebook.Note.runAll(Note.java:648)
        at 
org.apache.zeppelin.notebook.Notebook$CronJob.execute(Notebook.java:936)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        ... 1 more


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