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java.lang.NullPointerException at hudson.maven.MavenModuleSetBuild$1.isDescendantOf(MavenModuleSetBuild.java:246) at hudson.maven.MavenModuleSetBuild$1.<init>(MavenModuleSetBuild.java:215) at hudson.maven.MavenModuleSetBuild.getChangeSetFor(MavenModuleSetBuild.java:208) at hudson.maven.FilteredChangeLogSet.<init>(FilteredChangeLogSet.java:51) at hudson.maven.MavenBuild.getChangeSet(MavenBuild.java:183) at hudson.tasks.MailSender.appendBuildUrl(MailSender.java:216) at hudson.tasks.MailSender.createBackToNormalMail(MailSender.java:181) at hudson.tasks.MailSender.getMail(MailSender.java:168) at hudson.tasks.MailSender.execute(MailSender.java:100) at hudson.maven.reporters.MavenMailer.end(MavenMailer.java:55) at hudson.maven.AbstractMavenBuilder.end(AbstractMavenBuilder.java:103) at hudson.maven.MavenModuleSetBuild$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)