java.lang.NullPointerException: This exception has no message.

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DomNode.compareDocumentPosition NPE

This exception has no message.

java.lang.NullPointerException	at com.gargoylesoftware.htmlunit.html.DomNode.compareDocumentPosition(DomNode.java:436)	at com.gargoylesoftware.htmlunit.javascript.host.TextRange.jsxFunction_inRange(TextRange.java:239)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:161)