When trying to use the Git Publisher to push a tag after a successful release build, the build fails with the following exception:

java.lang.NullPointerException
at hudson.plugins.git.GitPublisher.perform(GitPublisher.java:192)
at hudson.plugins.release.ReleaseWrapper.executeBuildSteps(ReleaseWrapper.java:417)
at hudson.plugins.release.ReleaseWrapper.access$300(ReleaseWrapper.java:102)
at hudson.plugins.release.ReleaseWrapper$4.tearDown(ReleaseWrapper.java:364)
at hudson.model.Build$BuildExecution.doRun(Build.java:174)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:504)
at hudson.model.Run.execute(Run.java:1794)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:429)