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

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java.lang.NullPointerException:
at hudson.model.AbstractItem.getUrl(AbstractItem.java:110)
at hudson.model.Run.getUrl(Run.java:377)
at hudson.tasks.MailSender.appendBuildUrl(MailSender.java:138)
at hudson.tasks.MailSender.createFailureMail(MailSender.java:148)
at hudson.tasks.MailSender.getMail(MailSender.java:87)
at hudson.tasks.MailSender.execute(MailSender.java:64)
at hudson.tasks.Mailer.perform(Mailer.java:54)
at hudson.model.Build$RunnerImpl.post(Build.java:135)
at hudson.model.Run.run(Run.java:557)
at hudson.model.Build.run(Build.java:99)
at hudson.model.Executor.run(Executor.java:61)

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