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java.lang.NullPointerException: 	at java.util.ArrayList.addAll(Unknown Source)	at me.xthegamerplayz.FirstGame.rules.RatingSystem.getDefenseRating(RatingSystem.java:53)	at me.xthegamerplayz.FirstGame.board.White_AI.move(White_AI.java:26)	at me.xthegamerplayz.FirstGame.board.ChessBoard.tick(ChessBoard.java:29)	at me.xthegamerplayz.FirstGame.board.ChessBoard.(ChessBoard.java:21)	at me.xthegamerplayz.FirstGame.Game.render(Game.java:124)	at me.xthegamerplayz.FirstGame.Game.run(Game.java:70)	at java.lang.Thread.run(Unknown Source)