I found that just by closing the error dialog I can still browse and view the values of my dictionaries and variables and there seems to be no adverse effect on KM. YMMV.
I also googled "unocase" which pointed me to a discussion in this forum https://forum.keyboardmaestro.com/t/inconsistencies-in-lists-of-stored-km-variables/11201 from a couple of years ago that you might want to look at.