Caused by: java.lang.NullPointerException
	at org.apache.xml.serializer.ToStream.writeAttrString(ToStream.java:2099)
	at org.apache.xml.serializer.ToStream.processAttributes(ToStream.java:2079)
	at org.apache.xml.serializer.ToStream.endElement(ToStream.java:2224)
	at org.apache.xalan.transformer.TransformerIdentityImpl.endElement(TransformerIdentityImpl.java:1102)
	at org.apache.cocoon.xml.AbstractXMLPipe.endElement(AbstractXMLPipe.java:112)
	at org.apache.cocoon.xml.AbstractXMLPipe.endElement(AbstractXMLPipe.java:112)
	at org.apache.xml.serializer.ToXMLSAXHandler.endElement(ToXMLSAXHandler.java:263)
	at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:1401)
	at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:395)
	at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:178)
	at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:395)
	at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:178)
	at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2400)