Download the latest KolMafia build here.
Every new revision posted within the hour.
New EXE builds every Monday.
This happens if the character is deliberately naked and does things. Specifically I put on my Birthday Suit, did my inventory cleaning and then bought things and consumed. That triggered outfit switching and thus the saving of an empty check point.
This is not a suggestion that anything be done. It is an observation that will be needed when using the traces to diagnose unexpected nakedness. :-)
Yup. We cannot tell if you are "deliberately naked".
I hope this is temporary code that we can remove after detecting the unexpected nakedness issue.