Github user abellina commented on a diff in the pull request:
https://github.com/apache/spark/pull/21809#discussion_r217106065
--- Diff: core/src/main/scala/org/apache/spark/ui/jobs/StagePage.scala ---
@@ -182,6 +197,15 @@ private[ui] class StagePage(parent: StagesTab, store:
AppStatusStore) extends We
{Utils.bytesToString(stageData.diskBytesSpilled)}
</li>
}}
+ {if (!stageJobIds.isEmpty) {
--- End diff --
This could throw an NPE if `stageDataTuple` is `None`
```
scala> var x:Seq[Int] = null
x: Seq[Int] = null
scala> x.isEmpty
java.lang.NullPointerException
```
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