java.lang.NullPointerException: null
	at org.apache.dolphinscheduler.dao.utils.DagHelper.isTaskNodeNeedSkip(DagHelper.java:335) ~[classes/:na]
	at org.apache.dolphinscheduler.dao.utils.DagHelper.parsePostNodes(DagHelper.java:313) ~[classes/:na]
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.submitPostNode(WorkflowExecuteThread.java:860) [classes/:na]
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.taskFinished(WorkflowExecuteThread.java:395) [classes/:na]
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.taskStateChangeHandler(WorkflowExecuteThread.java:350) [classes/:na]
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.stateEventHandler(WorkflowExecuteThread.java:300) [classes/:na]
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.handleEvents(WorkflowExecuteThread.java:248) [classes/:na]
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.run(WorkflowExecuteThread.java:229) [classes/:na]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_212]
	at com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:125) [guava-24.1-jre.jar:na]
	at com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:57) [guava-24.1-jre.jar:na]
	at com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:78) [guava-24.1-jre.jar:na]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_212]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_212]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_212]