Oleg -
Thanks for your quick reply.
We have php running throughout our site, so we can't disable php warning messages globally. We have over 20,000 pages and need to know if there's an issue.
If those warning messages from sitemap generator can be ignored, can you add "error_reporting(E_ERROR);" or "error_reporting(-1);" to the beginning of the sitemap script so it's disabled for sitemap generator only?
That could be a quick fix for now, and then eventually maybe you could even add that into the configuration options?
Brian