NullPointerException when Optional field is None

[unthingable]

  case class JiraEvent(
    issue: String,
    itype: String,
    created: String,
    summary: String,
    assignee: String,
    reporter: String,
    status: String,
    eventDate: Option[Timestamp],
    eventActor: String,
    field: String,
    from: String,
    to: String
  )

java.lang.NullPointerException
  at com.github.potix2.spark.google.spreadsheets.Util$$anonfun$toRowData$1.apply(Util.scala:26)
  at com.github.potix2.spark.google.spreadsheets.Util$$anonfun$toRowData$1.apply(Util.scala:15)
  at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
  at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
  at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)

Row:

[XXX,YYY,,ZZZ,,,,null,someAuthor,someEvent,,]

      "com.github.potix2" %% "spark-google-spreadsheets" % "0.5.0",
      "org.apache.spark" %% "spark-core" % "2.1.0",
      "org.apache.spark" %% "spark-sql" % "2.1.0",