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java.lang.NullPointerException: 	at hudson.model.Run$Runner.access$000(Run.java:973)	at hudson.model.Run.reportCheckpoint(Run.java:950)	at hudson.model.CheckPoint.report(CheckPoint.java:113)	at hudson.tasks.MailSender.execute(MailSender.java:107)	at hudson.maven.reporters.MavenMailer.end(MavenMailer.java:54)	at hudson.maven.MavenModuleSetBuild$Builder.end(MavenModuleSetBuild.java:674)	at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:484)	at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:345)	at hudson.model.Run.run(Run.java:1090)	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:301)	at hudson.model.ResourceController.execute(ResourceController.java:93)	at hudson.model.Executor.run(Executor.java:122)