Oh yes - I could recreate that! I'll look at that as fast as possible. Thanks for reporting it
@haryour: you can download an updated version now http://vanillaforums.org/addon/profilevisitors-plugin
It fixes the bug you were showing. Thanks for your feedback!
Oh, I guess I've destroyed the guest logging...
Hope I have time to fix it today, sorry! If you do not track visit of guests it is fully working, though. And even if you do track those visits, I guess it is better to use the current version which at least doesn't show error messages
Alright, also fixed that! (deleting "=" in "<=" - that was easy )