java.lang.NullPointerException: This exception has no message.

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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.AbstractMavenBuilder.end(AbstractMavenBuilder.java:103)
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)

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