I get this exception when deleting a component in prefabs that have an ES3Prefab component on it.
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ArgumentException: An item with the same key has already been added. Key: null
System.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) (at <a8ed250850854b439cedc18931a314fe>:0)
System.Collections.Generic.Dictionary`2[TKey,TValue].Add (TKey key, TValue value) (at <a8ed250850854b439cedc18931a314fe>:0)
ES3Internal.ES3SerializableDictionary`2[TKey,TVal].OnAfterDeserialize () (at Assets/Plugins/Easy Save 3/Scripts/ES3SerializableDictionary.cs:42)
UnityEditor.EditorApplication:Internal_CallUpdateFunctions() (at ?)