self contains no data

Hi gang;
   After a long and productive, mostly uneventful, period of XML crunching
-- Thanks, in part, to your code & support! ---
I've started to see a number of segfaults occurring
in connection (sometimes) with a message along the lines of
   XML::LibXML::Node::nodeType -- self contains no data

This happens typically after long & complex document
construction & manipulation, so it's hard to pinpoint
what exactly happened.

My de-segfaulting skills have gotten quite rusty, and I was never so
good with XS, so I can only guess how to interpret what it
means that INT2PTR has given null.

I've gotten a reference to an int that is no longer
a valid indicator of a libxml2 Node object !?!?!
How would I have done that?

I realize that I noone can debug from the information
I've given, and it's hard for me to send a reproducible case;
but can anyone suggest places to start looking?
Is there some sort of tree-walk or validation I can
do to try to determine when this invalid thing might
have come into existence?

FWIW, I suspect that the problem is showing up now
because the evolution of my code is exercising
XML::LibXML differently, rather than a new bug in LibXML.
(also it seems to occur in versions 1.90 and 2.00, maybe earlier?)

Thanks in advance
bruce
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