[Error] NoMethodError in unmodified GSC v1.3.2 (Essentials v18.1)

[funnycatswag]

Hello,

I am working with Essentials GSC v1.3.2 unmodified. When using the Debug menu to attempt to create a new item, this error occurs right when the game SHOULD tell you that the item was successfully added.
What could be causing this error, does anyone have a solution? Cannot find anything online. Again, this is in an unmodified version of GSC 1.3.2, and the error also occurs in GCS 1.3.

[Pokémon Essentials version 18.1.dev]
Exception: NoMethodError
Message: undefined method `[]=' for nil:NilClass

Backtrace:
284:Editor_Screens:714:in `pbItemEditorNew'
284:Editor_Screens:631:in `pbItemEditor'
287:Editor_Listers:109:in `pbListScreenBlock'
287:Editor_Listers:91:in `loop'
287:Editor_Listers:91:in `pbListScreenBlock'
284:Editor_Screens:611:in `pbItemEditor'
281:Debug_Menu:757:in `pbDebugMenuActions'
069:MessageConfig:549:in `pbFadeOutIn'
281:Debug_Menu:757:in `pbDebugMenuActions'
281:Debug_Menu:861:in `pbDebugMenu'

This error also occurs if you attempt to delete an item with the Debug editor:

[Pokémon Essentials version 18.1.dev]
Exception: NoMethodError
Message: undefined method `[]' for nil:NilClass

Backtrace:
284:Editor_Screens:618:in `pbItemEditor'
284:Editor_Screens:618:in `delete_if'
284:Editor_Screens:618:in `pbItemEditor'
287:Editor_Listers:100:in `pbListScreenBlock'
287:Editor_Listers:91:in `loop'
287:Editor_Listers:91:in `pbListScreenBlock'
284:Editor_Screens:611:in `pbItemEditor'
281:Debug_Menu:757:in `pbDebugMenuActions'
069:MessageConfig:549:in `pbFadeOutIn'
281:Debug_Menu:757:in `pbDebugMenuActions'