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Matthias Gall wrote:
> I guess I know what you mean, because I don't find a way to check for a
> NULL in my LUA script now.
> Could you help me again please?

Just return a nil instead of a userdata(NULL).  I.e.:

  if (x)

> > PS: Be careful when using userdata objects with the default tag...
> Why?

Because there's no way to check whether the userdata objects you get are
really from you or which type of pointer they hold.

Ciao, ET.