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java.lang.NullPointerException: 	at hudson.maven.MavenModuleSetBuild$1.isDescendantOf(MavenModuleSetBuild.java:246)	at hudson.maven.MavenModuleSetBuild$1.(MavenModuleSetBuild.java:215)	at hudson.maven.MavenModuleSetBuild.getChangeSetFor(MavenModuleSetBuild.java:208)	at hudson.maven.FilteredChangeLogSet.(FilteredChangeLogSet.java:51)	at hudson.maven.MavenBuild.getChangeSet(MavenBuild.java:183)	at hudson.tasks.MailSender.appendBuildUrl(MailSender.java:216)	at hudson.tasks.MailSender.createBackToNormalMail(MailSender.java:181)	at hudson.tasks.MailSender.getMail(MailSender.java:168)	at hudson.tasks.MailSender.execute(MailSender.java:100)	at hudson.maven.reporters.MavenMailer.end(MavenMailer.java:55)	at hudson.maven.AbstractMavenBuilder.end(AbstractMavenBuilder.java:103)	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:758)	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:593)	at hudson.model.Run.execute(Run.java:1567)	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:477)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:237)