I see the following in my log. It happens only when I select "Send separate e-mails to individuals who broke the build" option. I am using Jenkins version 1.433

ERROR: Publisher hudson.tasks.Mailer aborted due to exception
java.lang.NullPointerException
Finished: FAILURE

I got the Mailer NullPointException when I took the remote node, on which the job was executing, offline.

Jenkins ver. 1.430. Debian GNU/Linux 6.0, 2.6.32-5-xen-amd64.

I have the following options on:
Send e-mail for every unstable build
Send separate e-mails to individuals who broke the build

The following was in Console Output:

Recording test results
ERROR: Publisher hudson.tasks.junit.JUnitResultArchiver aborted due to exception
hudson.remoting.RequestAbortedException: hudson.remoting.RequestAbortedException: hudson.remoting.Channel$OrderlyShutdown
at hudson.remoting.Request.call(Request.java:149)
at hudson.remoting.Channel.call(Channel.java:681)
at hudson.FilePath.act(FilePath.java:747)
at hudson.FilePath.act(FilePath.java:740)
at hudson.tasks.junit.JUnitParser.parse(JUnitParser.java:83)
at hudson.tasks.junit.JUnitResultArchiver.parse(JUnitResultArchiver.java:122)
at hudson.tasks.junit.JUnitResultArchiver.perform(JUnitResultArchiver.java:134)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:693)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:668)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:646)
at hudson.model.Build$RunnerImpl.post2(Build.java:162)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:615)
at hudson.model.Run.run(Run.java:1401)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:230)
Caused by: hudson.remoting.RequestAbortedException: hudson.remoting.Channel$OrderlyShutdown
at hudson.remoting.Request.abort(Request.java:273)
at hudson.remoting.Channel.terminate(Channel.java:732)
at hudson.remoting.Channel$CloseCommand.execute(Channel.java:826)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:1106)
Caused by: hudson.remoting.Channel$OrderlyShutdown
... 2 more
Caused by: Command close created at
at hudson.remoting.Command.<init>(Command.java:62)
at hudson.remoting.Command.<init>(Command.java:47)
at hudson.remoting.Channel$CloseCommand.<init>(Channel.java:822)
at hudson.remoting.Channel$CloseCommand.<init>(Channel.java:822)
at hudson.remoting.Channel.close(Channel.java:867)
at hudson.remoting.Channel$CloseCommand.execute(Channel.java:825)
... 1 more
ERROR: Publisher hudson.tasks.Mailer aborted due to exception
java.lang.NullPointerException

Is it reproduced with a recent Jenkins version?

I got the same error on the current LTS version of Jenkins - 1.532.2

ERROR: Publisher org.jenkinsci.plugins.xunit.XUnitPublisher aborted due to exception
hudson.remoting.RequestAbortedException: hudson.remoting.RequestAbortedException: java.io.IOException: Unexpected termination of the channel
at hudson.remoting.RequestAbortedException.wrapForRethrow(RequestAbortedException.java:41)
at hudson.remoting.RequestAbortedException.wrapForRethrow(RequestAbortedException.java:34)
at hudson.remoting.Request.call(Request.java:174)
at hudson.remoting.Channel.call(Channel.java:722)
at hudson.FilePath.act(FilePath.java:900)
at hudson.FilePath.act(FilePath.java:884)
at org.jenkinsci.plugins.xunit.XUnitProcessor.performTests(XUnitProcessor.java:114)
at org.jenkinsci.plugins.xunit.XUnitProcessor.performXUnit(XUnitProcessor.java:57)
at org.jenkinsci.plugins.xunit.XUnitPublisher.perform(XUnitPublisher.java:88)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:785)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:757)
at hudson.model.Build$BuildExecution.post2(Build.java:183)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:706)
at hudson.model.Run.execute(Run.java:1690)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:246)
Caused by: hudson.remoting.RequestAbortedException: java.io.IOException: Unexpected termination of the channel
at hudson.remoting.Request.abort(Request.java:299)
at hudson.remoting.Channel.terminate(Channel.java:782)
at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:69)
Caused by: java.io.IOException: Unexpected termination of the channel
at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:50)
Caused by: java.io.EOFException
at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2570)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1314)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
at hudson.remoting.Command.readFrom(Command.java:92)
at hudson.remoting.ClassicCommandTransport.read(ClassicCommandTransport.java:71)
at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:48)
ERROR: Publisher hudson.tasks.Mailer aborted due to exception
java.lang.NullPointerException
at hudson.tasks.MailSender.createFailureMail(MailSender.java:278)
at hudson.tasks.MailSender.getMail(MailSender.java:153)
at hudson.tasks.MailSender.execute(MailSender.java:101)
at hudson.tasks.Mailer.perform(Mailer.java:137)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:785)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:757)
at hudson.model.Build$BuildExecution.post2(Build.java:183)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:706)
at hudson.model.Run.execute(Run.java:1690)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:246)