Need help! Cannot read properties of undefined (reading 'getGuid')

My student is running into this issue and I cannot figure it out. I tried deleting the Hero Craft because it had a strange plane attached to it but I can’t delete anything. We also duplicated the Hero Craft accidently and can’t undo nor delete.
Help please :pensive:
Here is the link to the build

Hi @Ashley_Solano! This is caused by a known bug. In the topic below you can read how to fix this.