java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.jenkinsci.plugins.workflow.graph.FlowNode.getActions(FlowNode.java:259)
at hudson.model.Actionable.getAllActions(Actionable.java:94)
at hudson.model.Actionable.getAction(Actionable.java:165)
at org.jenkinsci.plugins.workflow.cps.nodes.StepStartNode.isBody(StepStartNode.java:61)
at org.jenkinsci.plugins.workflow.cps.nodes.StepEndNode.getTypeDisplayName(StepEndNode.java:35)
at org.jenkinsci.plugins.workflow.graph.FlowNode.getDisplayName(FlowNode.java:169)
at com.cloudbees.workflow.rest.external.FlowNodeExt.addBasicNodeData(FlowNodeExt.java:168)
at com.cloudbees.workflow.rest.external.FlowNodeExt.addBasicNodeData(FlowNodeExt.java:197)
at com.cloudbees.workflow.rest.external.FlowNodeExt.create(FlowNodeExt.java:144)
at com.cloudbees.workflow.rest.endpoints.flownode.Describe.get(Describe.java:71)
at com.cloudbees.workflow.rest.endpoints.FlowNodeAPI.doDescribe(FlowNodeAPI.java:56)

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