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

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java.lang.NullPointerException:
at org.jenkinsci.plugins.beakerbuilder.XMLEscapingVariableResolver.resolve(XMLEscapingVariableResolver.java:15)
at org.jenkinsci.plugins.beakerbuilder.XMLEscapingVariableResolver.resolve(XMLEscapingVariableResolver.java:5)
at hudson.Util.replaceMacro(Util.java:160)
at org.jenkinsci.plugins.beakerbuilder.JobSource.createDefaultJobFile(JobSource.java:65)
at org.jenkinsci.plugins.beakerbuilder.FileJobSource.createJobFile(FileJobSource.java:53)
at org.jenkinsci.plugins.beakerbuilder.BeakerBuilder.prepareJob(BeakerBuilder.java:130)
at org.jenkinsci.plugins.beakerbuilder.BeakerBuilder.perform(BeakerBuilder.java:77)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:770)
at hudson.model.Build$BuildExecution.build(Build.java:199)
at hudson.model.Build$BuildExecution.doRun(Build.java:160)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:533)
at hudson.model.Run.execute(Run.java:1745)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:89)
at hudson.model.Executor.run(Executor.java:240)

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