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

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at hudson.model.AbstractItem.getUrl(
at hudson.model.Run.getUrl(
at hudson.tasks.MailSender.appendBuildUrl(
at hudson.tasks.MailSender.createFailureMail(
at hudson.tasks.MailSender.getMail(
at hudson.tasks.MailSender.execute(
at hudson.tasks.Mailer.perform(
at hudson.model.Build$

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