error prevented apprentice staff from changing its types

[Hellcommander]

I got an error that prevented me from changing the type group for my apprentice staff and after I selected cancel changing the type it disappeared from my character inventory. Heres the error:
Lua Error: /data/chats/command-staff.lua:105: attempt to get length of local 'd_table_old' (a nil value)
At [C]:-1 __len
At /data/chats/command-staff.lua:105 update_table
At /data/chats/command-staff.lua:136 set_element
At /data/chats/command-staff.lua:227 action
At /engine/dialogs/Chat.lua:97 use
At /engine/dialogs/Chat.lua:50 fct
At /engine/ui/VariableList.lua:124 onUse
At /engine/ui/VariableList.lua:99 fct
At /engine/Mouse.lua:58 receiveMouse
At /engine/Mouse.lua:98 delegate
At /engine/ui/Dialog.lua:765 mouseEvent
At /engine/ui/Dialog.lua:485 fct
At /engine/Mouse.lua:58
and I think this error after it destroyed the staff:
Lua Error: /engine/interface/ActorInventory.lua:551: attempt to index local 'o' (a nil value)
At [C]:-1 __index
At /engine/interface/ActorInventory.lua:551 takeoffObject
At /data/chats/command-staff.lua:128 set_element
At /data/chats/command-staff.lua:227 action
At /engine/dialogs/Chat.lua:97 use
At /engine/dialogs/Chat.lua:50 fct
At /engine/ui/VariableList.lua:124 onUse
At /engine/ui/VariableList.lua:99 fct
At /engine/Mouse.lua:58 receiveMouse
At /engine/Mouse.lua:98 delegate
At /engine/ui/Dialog.lua:765 mouseEvent
At /engine/ui/Dialog.lua:485 fct
At /engine/Mouse.lua:58

[HousePet]

Wait, is that the fixed art Apprentice Staff?
I may need to fix that.