#vulnerable code 
                                void onData(final Cell cell) {
        final DyeCell dye;
        if (CellType.NUMERIC == cell.getCellType()) {
            /*
             * Buf for date exporting here
             */
            final double cellValue = cell.getNumericCellValue();
            if (DateUtil.isValidExcelDate(cellValue)) {
                final Date value = DateUtil.getJavaDate(cellValue, TimeZone.getDefault());
                final LocalDateTime datetime = Ut.toDateTime(value);
                final LocalTime time = datetime.toLocalTime();
                if (LocalTime.MIN == time) {
                    /*
                     * LocalDate
                     */
                    dye = this.onDataValue("DATA-DATE").dateFormat(false);
                } else {
                    /*
                     * LocalDateTime
                     */
                    dye = this.onDataValue("DATA-DATETIME").dateFormat(true);
                }
            } else {
                /*
                 * Number
                 */
                dye = this.onDataValue("DATA-VALUE");
            }
        } else {
            /*
             * Other
             */
            dye = this.onDataValue("DATA-VALUE");
        }
        cell.setCellStyle(dye.build());
    } 
                            #location 16 
                            #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());
    }