After upgrading clone-workspace-plugin from 0.3 to 0.4 this happens at the end of the job when it is supposed to start archiving:-

BUILD SUCCESSFUL
Total time: 5 minutes 1 second
Archiving workspace
ERROR: Publisher hudson.plugins.cloneworkspace.CloneWorkspacePublisher aborted due to exception
java.lang.NullPointerException
at hudson.plugins.cloneworkspace.CloneWorkspacePublisher.snapshot(CloneWorkspacePublisher.java:211)
at hudson.plugins.cloneworkspace.CloneWorkspacePublisher.perform(CloneWorkspacePublisher.java:170)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:682)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:657)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:635)
at hudson.model.Build$RunnerImpl.post2(Build.java:161)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:604)
at hudson.model.Run.run(Run.java:1400)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:175)
Email was triggered for: Failure