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java.lang.NullPointerException: 	at org.icefaces.mobi.component.thumbnail.ThumbnailRenderer.encodeEnd(ThumbnailRenderer.java:52)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:881)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)	at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)	at org.icefaces.impl.renderkit.RendererWrapper.encodeChildren(RendererWrapper.java:49)	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851)	at org.icefaces.mobi.utils.JSFUtils.renderChild(JSFUtils.java:223)	at org.icefaces.mobi.utils.JSFUtils.renderChildren(JSFUtils.java:211)	at org.icefaces.mobi.component.viewmanager.ViewRenderer.encodeChildren(ViewRenderer.java:61)	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851)	at org.icefaces.mobi.utils.JSFUtils.renderChild(JSFUtils.java:223)	at org.icefaces.mobi.utils.JSFUtils.renderChildren(JSFUtils.java:211)	at org.icefaces.mobi.component.viewmanager.ViewManagerRenderer.encodeChildren(ViewManagerRenderer.java:149)