Seam nuxeo conversation NPE

2013-11-20 23:23:33,009 ERROR [http-bio-0.0.0.0-8080-exec-34] [facelets.viewhandler] Error Rendering View[/view_admin.xhtml]
java.lang.NullPointerException
	at org.jboss.seam.core.Manager.isReallyLongRunningConversation(Manager.java:258)
	at org.jboss.seam.core.Conversation.isLongRunning(Conversation.java:323)
	at org.nuxeo.ecm.platform.ui.web.application.NuxeoConversationStateHolder.saveState(NuxeoConversationStateHolder.java:132)
	at org.ajax4jsf.application.AjaxStateManager.saveStateInSession(AjaxStateManager.java:523)
	at org.ajax4jsf.application.AjaxStateManager.buildViewState(AjaxStateManager.java:503)
	at org.ajax4jsf.application.AjaxStateManager$SeamStateManagerWrapper.saveView(AjaxStateManager.java:105)
	at org.jboss.seam.jsf.SeamStateManager.saveView(SeamStateManager.java:89)
	at org.ajax4jsf.application.AjaxStateManager.saveSerializedView(AjaxStateManager.java:454)
	at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:615)
	at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
	at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
	at org.nuxeo.ecm.platform.ui.web.lifecycle.NuxeoLifeCycleImpl.render(NuxeoLifeCycleImpl.java:98)
	...