"Session side effect"

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I'm being tortured by this warning:

Warning: Unknown(): Your script possibly relies on a session
side-effect which existed until PHP 4.2.3. ...

I've looked the code up and down and I'm no longer using any variables
that aren't acquired via $_SESSION['xyx'], etc.  What else could
trigger this warning message?

The only idea I have is that I am checking some variables using
"isset".  The section of code in question is inserted in different
contexts, so I use that to taylor its behavior, would the warning
appear just because I checked for the existence of a non-existent
variable?  If so, that kind of defeats the purpose it seems.

Thanks for any leads.

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