java.lang.RuntimeException: java.lang.NullPointerException

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java.lang.RuntimeException: java.lang.NullPointerException
at org.apache.lenya.cms.publication.DefaultDocumentBuilder.isDocument(DefaultDocumentBuilder.java:119)
at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.avalon.excalibur.component.ComponentProxyGenerator$ComponentInvocationHandler.invoke(ComponentProxyGenerator.java:143)
at undefined.$Proxy44.isDocument(Unknown Source)

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