if the value property is null then you get an NPE from the renderer e.g.

  | java.lang.NullPointerException
  |     at java.io.PrintWriter.write(PrintWriter.java:401)
  |     at 
com.sun.faces.renderkit.html_basic.HtmlResponseWriter.write(HtmlResponseWriter.java:495)
  |     at 
org.jboss.seam.ui.renderkit.FormattedTextRendererBase.doEncodeBegin(FormattedTextRendererBase.java:24)
  |     at 
org.jboss.seam.ui.util.cdk.RendererBase.encodeBegin(RendererBase.java:79)
  |     at 
javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:785)
  |     at 
org.ajax4jsf.framework.renderer.RendererBase.renderChild(RendererBase.java:280)
  |     at 
org.ajax4jsf.framework.renderer.RendererBase.renderChildren(RendererBase.java:262)
  |     at 
org.richfaces.renderkit.TabRendererBase.encodeChildren(TabRendererBase.java:113)
  |     at 
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:809)
  |     at 
org.ajax4jsf.framework.renderer.RendererBase.renderChild(RendererBase.java:282)
  |     at 
org.ajax4jsf.framework.renderer.RendererBase.renderChildren(RendererBase.java:262)
  |     at 
org.richfaces.renderkit.html.TabPanelRenderer.doEncodeChildren(TabPanelRenderer.java:272)
  |     at 
org.richfaces.renderkit.html.TabPanelRenderer.doEncodeChildren(TabPanelRenderer.java:267)
  | 

Cheers
J

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