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

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java.lang.NullPointerException:
at join.JoinAction$NoopLauncher.(JoinAction.java:120)
at join.JoinAction.checkPendingDownstream(JoinAction.java:92)
at join.JoinAction.downstreamFinished(JoinAction.java:70)
at join.JoinDependency.shouldTriggerBuild(JoinDependency.java:45)
at hudson.tasks.BuildTrigger.execute(BuildTrigger.java:213)
at hudson.model.AbstractBuild$AbstractBuildExecution.cleanUp(AbstractBuild.java:741)
at hudson.model.Build$BuildExecution.cleanUp(Build.java:194)
at hudson.model.Run.execute(Run.java:1715)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:231)

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