I get an instacrash when opening a blueprint book and pressing the duplicate button, during normal gameplay. The blueprint book comes form another blueprint book in my library.

Error while running event Kux-BlueprintExtensions::on_player_cursor_stack_changed (ID 35)
Index out of inventory bounds.
stack traceback:
[C]: in function 'index'
__Kux-BlueprintExtensions/modules/util.lua:118: in function 'get_blueprint'
Kux-BlueprintExtensions/modules/util.lua:97: in function 'get_blueprint'
Kux-BlueprintExtensions/modules/gui.lua:58: in function 'update_visibility'
Kux-BlueprintExtensions/control.lua:55: in function 'fnc'
Kux-CoreLib/lib/EventDistributor.lua:161: in function <Kux-CoreLib/lib/EventDistributor.lua:151>"

Can provide the blueprint if it depends on the content.

thy for reporting it, I'll take care of it

I think I have found it
active_index is not updated when blueprint is moved or deleted
this is either a bug in the API or intentional. never mind. i work around it now

thanks!