NPE when viewing a page on mobile

2013-12-19 10:31:32,269 ERROR [http-8080-5] [atlassian.event.internal.AsynchronousAbleEventDispatcher] run There was an exception thrown trying to dispatch event 'com.atlassian.confluence.event.events.content.blogpost.BlogPostViewEvent[source=com.atlassian.confluence.plugins.mobile.rest.ContentResource@1c8b1dca]' from the invoker 'LegacyListenerInvoker{eventListener=com.atlassian.confluence.event.listeners.ReferralListener@2f17bb5e}'.
 -- url: /confluence/rest/mobile/1.0/content/1572905 | userName: admin
java.lang.NullPointerException
	at com.atlassian.confluence.event.listeners.ReferralListener.handleEvent(ReferralListener.java:55)
	at com.atlassian.event.legacy.LegacyListenerHandler$LegacyListenerInvoker.invoke(LegacyListenerHandler.java:55)
	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$2.run(AsynchronousAbleEventDispatcher.java:66)
	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1.execute(AsynchronousAbleEventDispatcher.java:32)
	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:60)
	at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:160)
	at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:79)
	at sun.reflect.GeneratedMethodAccessor536.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
	at com.sun.proxy.$Proxy251.publish(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor536.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
...