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

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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.AbstractMavenBuilder.end(
at hudson.model.AbstractBuild$
at hudson.model.Run.execute(
at hudson.model.ResourceController.execute(

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