javax.faces.FacesException: java.lang.NullPointerException

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java.lang.NullPointerException
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java.lang.NullPointerException:
at com.icesoft.faces.util.DOMUtils.domDiff(DOMUtils.java:256)
at com.icesoft.faces.context.PushModeSerializer.serialize(PushModeSerializer.java:34)
at com.icesoft.faces.context.BridgeFacesContext$SaveCurrentDocument.serialize(BridgeFacesContext.java:924)
at com.icesoft.faces.context.DOMResponseWriter.endDocument(DOMResponseWriter.java:191)
at com.icesoft.faces.facelets.D2DFaceletViewHandler.renderResponse(D2DFaceletViewHandler.java:285)
at com.icesoft.faces.application.D2DViewHandler.renderView(D2DViewHandler.java:159)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
at com.icesoft.faces.webapp.xmlhttp.PersistentFacesState.render(PersistentFacesState.java:176)
at com.icesoft.faces.webapp.xmlhttp.PersistentFacesState.executeAndRender(PersistentFacesState.java:312)
at com.icesoft.faces.async.render.RunnableRender.run(RunnableRender.java:143)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665)
at java.lang.Thread.run(Thread.java:619)

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