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java.lang.NullPointerException: 	at hudson.model.Run$Runner.access$000(	at hudson.model.Run.reportCheckpoint(	at	at hudson.tasks.MailSender.execute(	at hudson.maven.reporters.MavenMailer.end(	at hudson.maven.MavenModuleSetBuild$Builder.end(	at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(	at hudson.model.AbstractBuild$	at	at	at hudson.model.ResourceController.execute(	at