NullPointerException in ParagraphJobStatus

java.lang.NullPointerException
    at org.apache.zeppelin.rest.message.ParagraphJobStatus.<init>(ParagraphJobStatus.java:49)
    at org.apache.zeppelin.rest.message.NoteJobStatus.lambda$new$0(NoteJobStatus.java:39)
    at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
    at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
    at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566)
    at org.apache.zeppelin.rest.message.NoteJobStatus.<init>(NoteJobStatus.java:40)