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java.lang.NullPointerException at hudson.maven.MavenModuleSetBuild$1.isDescendantOf( at hudson.maven.MavenModuleSetBuild$1.<init>( at hudson.maven.MavenModuleSetBuild.getChangeSetFor( at hudson.maven.FilteredChangeLogSet.<init>( at hudson.maven.MavenBuild.getChangeSet( at hudson.tasks.MailSender.appendBuildUrl( at hudson.tasks.MailSender.createBackToNormalMail( at hudson.tasks.MailSender.getMail( at hudson.tasks.MailSender.execute( at hudson.maven.reporters.MavenMailer.end( at hudson.maven.AbstractMavenBuilder.end( at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun( at hudson.model.AbstractBuild$ at hudson.model.Run.execute( at at hudson.model.ResourceController.execute( at