Interesting, the error is in the tutorial hiding code. I couldn't replicate this unfortunately :( I will try to find more specific reason for that.
Viewing post in 🦠The Scale Land jam comments
Ursina engine for python is quite small engine (and it's filled with internal engine bugs) :) And i found out if you call .disable() function on disabled object it shows an error and quits, but if you use object.disabled = True on disabled object, then no error accurs. So i am going to change disable() to disabled=True after jam period :)