#vulnerable code 
                                void onData(final Cell cell) {
        final DyeCell dyeCell = Fn.pool(this.stylePool, "DATA",
                () -> DyeCell.create(this.workbook)
                        .border(BorderStyle.THIN)
                        .align(null, VerticalAlignment.TOP)
                        .font(13, false));
        cell.setCellStyle(dyeCell.build());
    } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                void onTable(final Cell cell) {
        final DyeCell dyeCell = Fn.pool(this.stylePool, "TABLE",
                () -> DyeCell.create(this.workbook)
                        .color("FFFFFF", "3EB7FF")
                        .align(HorizontalAlignment.CENTER)
                        .border(BorderStyle.THIN)
                        .font(13, false));
        cell.setCellStyle(dyeCell.build());
    }