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

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java.lang.NullPointerException:
at hudson.plugins.im.IMPublisher.getUpstreamBuilds(IMPublisher.java:463)
at hudson.plugins.im.IMPublisher.getUpstreamBuildsSinceLastStable(IMPublisher.java:435)
at hudson.plugins.im.IMPublisher.getNearestUpstreamCommitters(IMPublisher.java:411)
at hudson.plugins.im.IMPublisher.notifyUpstreamCommitters(IMPublisher.java:364)
at hudson.plugins.im.IMPublisher.perform(IMPublisher.java:324)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:603)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.cleanUp(MavenModuleSetBuild.java:675)
at hudson.model.Run.run(Run.java:1408)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:349)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:145)

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