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java.lang.NullPointerException: 	at org.apache.spark.sql.execution.ui.SQLListener.onTaskEnd(SQLListener.scala:167)	at org.apache.spark.scheduler.SparkListenerBus$class.onPostEvent(SparkListenerBus.scala:42)	at org.apache.spark.scheduler.LiveListenerBus.onPostEvent(LiveListenerBus.scala:31)	at org.apache.spark.scheduler.LiveListenerBus.onPostEvent(LiveListenerBus.scala:31)	at org.apache.spark.util.ListenerBus$class.postToAll(ListenerBus.scala:55)	at org.apache.spark.util.AsynchronousListenerBus.postToAll(AsynchronousListenerBus.scala:37)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(AsynchronousListenerBus.scala:80)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(AsynchronousListenerBus.scala:65)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(AsynchronousListenerBus.scala:65)	at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1$$anonfun$run$1.apply$mcV$sp(AsynchronousListenerBus.scala:64)	at org.apache.spark.util.Utils$.tryOrStopSparkContext(Utils.scala:1181)	at org.apache.spark.util.AsynchronousListenerBus$$anon$1.run(AsynchronousListenerBus.scala:63)