Attempting to run the Checkpoint post-build action step returns the following error:

ERROR: Publisher hudson.scm.IntegrityCheckpointAction aborted due to exception
java.lang.NullPointerException
at hudson.scm.IntegrityCheckpointAction.perform(IntegrityCheckpointAction.java:196)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:45)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:785)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:757)
at hudson.model.Build$BuildExecution.cleanUp(Build.java:192)
at hudson.model.Run.execute(Run.java:1723)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:231)