When I configure a project with the postbuild action of sending a campfire notification I get the following exception in the console log of the build and no notification is sent to campfire.

ERROR: Publisher hudson.plugins.campfire.CampfireNotifier aborted due to exception
java.lang.NullPointerException
at hudson.plugins.campfire.CampfireNotifier.publish(CampfireNotifier.java:48)
at hudson.plugins.campfire.CampfireNotifier.perform(CampfireNotifier.java:80)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:710)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:685)
at hudson.model.Build$RunnerImpl.post2(Build.java:162)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:632)
at hudson.model.Run.run(Run.java:1463)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:239)