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

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java.lang.NullPointerException:
at hudson.plugins.emailext.plugins.recipients.RequesterRecipientProvider.addRecipients(RequesterRecipientProvider.java:46)
at hudson.plugins.emailext.ExtendedEmailPublisher.createMail(ExtendedEmailPublisher.java:590)
at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:331)
at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:322)
at hudson.plugins.emailext.ExtendedEmailPublisher.perform(ExtendedEmailPublisher.java:230)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:770)
at hudson.model.Run.execute(Run.java:1804)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:537)
at hudson.model.ResourceController.execute(ResourceController.java:89)
at hudson.model.Executor.run(Executor.java:240)

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