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java.lang.NullPointerException: 	at javax.mail.internet.InternetAddress.toString(InternetAddress.java:461)	at javax.mail.internet.InternetAddress.toString(InternetAddress.java:426)	at javax.mail.internet.MimeMessage.setAddressHeader(MimeMessage.java:707)	at javax.mail.internet.MimeMessage.setReplyTo(MimeMessage.java:694)	at jenkins.plugins.mailer.tasks.MimeMessageBuilder.buildMimeMessage(MimeMessageBuilder.java:179)	at hudson.tasks.MailSender.createEmptyMail(MailSender.java:399)	at hudson.tasks.MailSender.createFailureMail(MailSender.java:262)	at hudson.tasks.MailSender.createMail(MailSender.java:180)	at hudson.tasks.MailSender.run(MailSender.java:109)	at hudson.tasks.MailSender.execute(MailSender.java:103)	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.cleanUp(MavenModuleSetBuild.java:1065)	at hudson.model.Run.execute(Run.java:1785)	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:531)	at hudson.model.ResourceController.execute(ResourceController.java:98)	at hudson.model.Executor.run(Executor.java:410)