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java.lang.NullPointerException: 	at java.lang.String.startsWith(String.java:1421)	at java.lang.String.startsWith(String.java:1450)	at hudson.maven.MavenModuleSetBuild$1.isDescendantOf(MavenModuleSetBuild.java:178)	at hudson.maven.MavenModuleSetBuild$1.(MavenModuleSetBuild.java:147)	at hudson.maven.MavenModuleSetBuild.getChangeSetFor(MavenModuleSetBuild.java:141)	at hudson.maven.FilteredChangeLogSet.(FilteredChangeLogSet.java:51)	at hudson.maven.MavenBuild.getChangeSet(MavenBuild.java:161)	at hudson.model.AbstractBuild.hasParticipant(AbstractBuild.java:315)	at hudson.model.AbstractProject.hasParticipant(AbstractProject.java:1255)	at hudson.model.User.getProjects(User.java:381)	at hudson.scm.SubversionMailAddressResolverImpl.findMailAddressFor(SubversionMailAddressResolverImpl.java:20)	at hudson.tasks.MailAddressResolver.resolve(MailAddressResolver.java:97)	at hudson.tasks.Mailer$UserProperty.getAddress(Mailer.java:496)	at hudson.tasks.MailSender.buildCulpritList(MailSender.java:380)	at hudson.tasks.MailSender.createEmptyMail(MailSender.java:345)	at hudson.tasks.MailSender.createFailureMail(MailSender.java:219)	at hudson.tasks.MailSender.getMail(MailSender.java:146)	at hudson.tasks.MailSender.execute(MailSender.java:94)	at hudson.maven.MavenModuleSetBuild$RunnerImpl.cleanUp(MavenModuleSetBuild.java:619)	at hudson.model.Run.run(Run.java:1323)	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:293)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:139)