NPE in MirrorVirtualProvider

StampedeTest shows the following NPE:

FAILURE in action LoadDocumentAction on path null : java.lang.NullPointerException(null)
java.lang.NullPointerException
at org.hippoecm.repository.jackrabbit.MirrorVirtualProvider.populate(MirrorVirtualProvider.java:125)
at org.hippoecm.repository.dataprovider.HippoNodeId.populate(HippoNodeId.java:68)
at org.hippoecm.repository.jackrabbit.HippoLocalItemStateManager.getNodeState(HippoLocalItemStateManager.java:424)
at org.apache.jackrabbit.core.state.LocalItemStateManager.getItemState(LocalItemStateManager.java:172)
at org.apache.jackrabbit.core.state.ForkedXAItemStateManager.getItemState(ForkedXAItemStateManager.java:263)
at org.hippoecm.repository.jackrabbit.HippoLocalItemStateManager.getItemState(HippoLocalItemStateManager.java:321)
at org.apache.jackrabbit.core.state.SessionItemStateManager.getItemState(SessionItemStateManager.java:161)
at org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:392)
at org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:359)
at org.apache.jackrabbit.core.ItemManager.getNode(ItemManager.java:652)
at org.apache.jackrabbit.core.LazyItemIterator.prefetchNext(LazyItemIterator.java:120)
at org.apache.jackrabbit.core.LazyItemIterator.<init>(LazyItemIterator.java:104)
at org.apache.jackrabbit.core.ItemManager.getChildNodes(ItemManager.java:738)
at org.apache.jackrabbit.core.NodeImpl$9.perform(NodeImpl.java:2159)
at org.apache.jackrabbit.core.NodeImpl$9.perform(NodeImpl.java:2155)
at org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:200)
at org.apache.jackrabbit.core.ItemImpl.perform(ItemImpl.java:91)
at org.apache.jackrabbit.core.NodeImpl.getNodes(NodeImpl.java:2155)
at org.hippoecm.repository.decorating.NodeDecorator.getNodes(NodeDecorator.java:235)
at org.hippoecm.repository.decorating.checked.NodeDecorator.getNodes(NodeDecorator.java:287)
at org.hippoecm.repository.action.LoadDocumentAction.traverse(LoadDocumentAction.java:49)
at org.hippoecm.repository.action.LoadDocumentAction.traverse(LoadDocumentAction.java:52)
at org.hippoecm.repository.action.LoadDocumentAction.doExecute(LoadDocumentAction.java:40)
at org.hippoecm.repository.action.Action.execute(Action.java:38)
at org.hippoecm.repository.RandomActionTest$RandomActionRunner.step(RandomActionTest.java:219)
at org.hippoecm.repository.RandomActionTest$RandomActionRunner.run(RandomActionTest.java:166)
at java.lang.Thread.run(Thread.java:662)