Thank you for fixing the previous crash report, but I have found another. This one also is about applying attributes to an item.
If the attribute name is misspelled, the game crashes.

Fixed in ef113dd. Stupid mistake on my end, sorry about that.

@jqck3d Thanks for reporting again, a fix has been released: https://www.curseforge.com/minecraft/mc-mods/ibe-editor/files/3052329