Possible NPE for system jcr sessions

I started up gogreen trunk with an existing repo with auto-export enabled. I then got in the console

[INFO] [talledLocalContainer] 20.08.2013 09:00:27 ERROR [org.onehippo.cms7.autoexport.EventProcessor$1.run():99] java.lang.NullPointerException : null
[INFO] [talledLocalContainer] java.lang.NullPointerException
[INFO] [talledLocalContainer] at org.hippoecm.repository.FacetedNavigationEngineImpl$ContextImpl.getAuthorisationIdSet(FacetedNavigationEngineImpl.java:237)
[INFO] [talledLocalContainer] at org.hippoecm.repository.FacetedNavigationEngineImpl.doView(FacetedNavigationEngineImpl.java:391)
[INFO] [talledLocalContainer] at org.hippoecm.repository.FacetedNavigationEngineImpl.view(FacetedNavigationEngineImpl.java:340)
[INFO] [talledLocalContainer] at org.hippoecm.repository.FacetedNavigationEngineImpl.view(FacetedNavigationEngineImpl.java:92)
[INFO] [talledLocalContainer] at org.hippoecm.repository.jackrabbit.facetnavigation.FacetNavigationProvider.doPopulate(FacetNavigationProvider.java:255)
[INFO] [talledLocalContainer] at org.hippoecm.repository.jackrabbit.facetnavigation.FacetNavigationProvider.populate(FacetNavigationProvider.java:90)
[INFO] [talledLocalContainer] at org.hippoecm.repository.jackrabbit.HippoLocalItemStateManager.getItemState(HippoLocalItemStateManager.java:384)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.state.SessionItemStateManager.getItemState(SessionItemStateManager.java:161)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:382)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.ItemManager.getNode(ItemManager.java:669)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.ItemManager.getNode(ItemManager.java:647)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.LazyItemIterator.prefetchNext(LazyItemIterator.java:120)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.LazyItemIterator.next(LazyItemIterator.java:257)
[INFO] [talledLocalContainer] at org.hippoecm.repository.decorating.RangeIteratorDecorator.next(RangeIteratorDecorator.java:112)
[INFO] [talledLocalContainer] at org.hippoecm.repository.decorating.NodeIteratorDecorator.nextNode(NodeIteratorDecorator.java:54)
[INFO] [talledLocalContainer] at org.hippoecm.repository.jackrabbit.xml.AbstractSAXEventGenerator.process(AbstractSAXEventGenerator.java:215)
[INFO] [talledLocalContainer] at org.hippoecm.repository.jackrabbit.xml.PhysicalSysViewSAXEventGenerator.process(PhysicalSysViewSAXEventGenerator.java:55)
[INFO] [talledLocalContainer] at org.hippoecm.repository.jackrabbit.xml.AbstractSAXEventGenerator.serialize(AbstractSAXEventGenerator.java:159)
[INFO] [talledLocalContainer] at org.hippoecm.repository.jackrabbit.xml.SysViewSAXEventGenerator.serialize(SysViewSAXEventGenerator.java:45)
[INFO] [talledLocalContainer] at org.hippoecm.repository.impl.SessionDecorator.exportDereferencedView(SessionDecorator.java:238)
[INFO] [talledLocalContainer] at org.onehippo.cms7.autoexport.Exporter.exportDereferencedView(Exporter.java:159)
[INFO] [talledLocalContainer] at org.onehippo.cms7.autoexport.Exporter.exportContentResource(Exporter.java:137)
[INFO] [talledLocalContainer] at org.onehippo.cms7.autoexport.Exporter.export(Exporter.java:110)
[INFO] [talledLocalContainer] at org.onehippo.cms7.autoexport.Exporter.export(Exporter.java:103)
[INFO] [talledLocalContainer] at org.onehippo.cms7.autoexport.EventProcessor.export(EventProcessor.java:403)
[INFO] [talledLocalContainer] at org.onehippo.cms7.autoexport.EventProcessor.processEvents(EventProcessor.java:326)
[INFO] [talledLocalContainer] at org.onehippo.cms7.autoexport.EventProcessor.access$000(EventProcessor.java:56)
[INFO] [talledLocalContainer] at org.onehippo.cms7.autoexport.EventProcessor$1.run(EventProcessor.java:95)
[INFO] [talledLocalContainer] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
[INFO] [talledLocalContainer] at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
[INFO] [talledLocalContainer] at java.util.concurrent.FutureTask.run(FutureTask.java:138)
[INFO] [talledLocalContainer] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
[INFO] [talledLocalContainer] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
[INFO] [talledLocalContainer] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
[INFO] [talledLocalContainer] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
[INFO] [talledLocalContainer] at java.lang.Thread.run(Thread.java:662)