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java.lang.NullPointerException: 	at java.util.StringTokenizer.(StringTokenizer.java:199)	at java.util.StringTokenizer.(StringTokenizer.java:236)	at hudson.tasks.MailSender.createEmptyMail(MailSender.java:326)	at hudson.tasks.MailSender.createUnstableMail(MailSender.java:186)	at hudson.tasks.MailSender.getMail(MailSender.java:160)	at hudson.tasks.MailSender.execute(MailSender.java:100)	at hudson.maven.reporters.MavenMailer.end(MavenMailer.java:56)	at hudson.maven.AbstractMavenBuilder.end(AbstractMavenBuilder.java:103)	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:829)	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:566)	at hudson.model.Run.execute(Run.java:1678)	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:509)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:231)