NullReferenceException after loading a new scene ?

Hello, i know that there is many of questions on NullReferenceException, but mine problem with this error is a bit strange. Mine code works normally at the first scene but when i load a second one iam getting this error [NullReferenceException: Object reference not set to an instance of an object HeroEditor.Common.CharacterEditorBase.A (UnityEngine.UI.Dropdown[] except)], also my inspector still shows that variable isnt null.

Here is my code:

Does someone know how to solve this error? Thanks.