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----- Original Message -----
> Is there a safe value to use for a null ref? -1 perhaps?

Hmmm.... -1  .. Maybe 17, 0x4345ABCD or "FD" :-)) ... Max you need to give
us some idea of your problem. In Lua 'nil' is the "nothing" value ...
Another offen seen solutions is a dead tag on userdata ... Give us something
more to work with!