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I think this has to do with Mummy and Knock Off being used on Cofagrigus.
[Pokémon Essentials version 19.1]
[Generation 8 Project v1.0.2]
Exception: NoMethodError
Message: undefined method `>=' for #<GameData::Ability>
Backtrace:
142:BattleHandlers_Abilities:1602:in `block in <main>'...