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java.lang.NullPointerException: 	at java.util.StringTokenizer.(	at java.util.StringTokenizer.(	at hudson.tasks.MailSender.createEmptyMail(	at hudson.tasks.MailSender.createUnstableMail(	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