NPOI.XSSF.UserModel.XSSFClientAnchor.cs may have a bug with null reference error

[aljcn]

        public override int Dx1
        {
            get
            {
                return (int)Cell1.colOff;
            }
            set
            {
                //cell1.colOff = value;           //Update By Jman 2025.12.18
                Cell1.colOff = value;
            }
        }

        public override int Dy1
        {
            get
            {
                return (int)Cell1.rowOff;
            }
            set
            {
                //cell1.rowOff = value;       //Update By Jman 2025.12.18
                Cell1.rowOff = value;
            }
        }

        public override int Dy2
        {
            get
            {
                return (int)Cell2.rowOff;
            }
            set
            {
                //cell2.rowOff = value;       //Update By Jman 2025.12.18
                Cell2.rowOff = value;
            }
        }

        public override int Dx2
        {
            get
            {
                return (int)Cell2.colOff;
            }
            set
            {
                //cell2.colOff = value;       //Update By Jman 2025.12.18
                Cell2.colOff = value;
            }
        }

        public int Col1
        {
            get
            {
                //return cell1.col;     //Update By Jman 2025.12.18
                return Cell1.col;
            }
            set
            {
                Cell1.col=value;
            }
        }

        public int Col2
        {
            get
            {
                return Cell2.col;         
            }
            set
            {
                //cell2.col = value;    //Update By Jman 2025.12.18
                Cell2.col=value;
            }
        }

        public int Row1
        {
            get
            {
                return Cell1.row;
            }
            set
            {
                //cell1.row = value;      //Update By Jman 2025.12.18
                Cell1.row=value;
            }
        }

        public int Row2
        {
            get
            {
                return Cell2.row;
            }
            set
            {
                //cell2.row = value;    //Update By Jman 2025.12.18
                Cell2.row=value;
            }
        }

after fixed， runs well when shiftrows with picture