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This exception has no message.
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.createUnstableMail(MailSender.java:223) at hudson.tasks.MailSender.createMail(MailSender.java:185) at hudson.tasks.MailSender.run(MailSender.java:109) at hudson.tasks.MailSender.execute(MailSender.java:103) at hudson.maven.reporters.MavenMailer.end(MavenMailer.java:74) at hudson.maven.AbstractMavenBuilder.end(AbstractMavenBuilder.java:104) at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:859) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534) at hudson.model.Run.execute(Run.java:1738) at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:531) at hudson.model.ResourceController.execute(ResourceController.java:98) at hudson.model.Executor.run(Executor.java:410)