这段代码在运行时为我提供了Nullpointer Excpetion，我在做什么错？

Question

我正在尝试使用BLOBS从本地数据库中保存并获取图像。尝试从本地数据库中获取一个时，在某些时候会给我Nullpointer异常。

java文件中的方法

 public Image[] getCategories(){
        ResultSet rs = null;
        List<Image> categories = new ArrayList<>();

        try {
            rs = statement.executeQuery("SELECT * FROM category");
            while (rs.next()) {
                Blob imageBlob = rs.getBlob(3);
                InputStream in = imageBlob.getBinaryStream();
                BufferedImage bfImage = ImageIO.read(in);
                Image image = SwingFXUtils.toFXImage(bfImage, null );
                categories.add(image);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        Image[] itemsArray = new Image[categories.size()];
        itemsArray = categories.toArray(itemsArray);
        return itemsArray;
    }

数据库代码

CREATE TABLE IF NOT EXISTS `order_system`.`Category` (
  `idCategory` INT(11) NOT NULL AUTO_INCREMENT,
  `Name` VARCHAR(45) NOT NULL,
  `Icon` LONGBLOB NULL DEFAULT NULL,
  PRIMARY KEY (`idCategory`),
  UNIQUE INDEX `Name_UNIQUE` (`Name` ASC))
ENGINE = InnoDB
DEFAULT CHARACTER SET = utf8;

例外

Caused by: java.lang.NullPointerException
    at javafx.swing/javafx.embed.swing.SwingFXUtils.toFXImage(SwingFXUtils.java:74)
    at shop.Model.getCategories(Model.java:47)
    at shop.Controller.<init>(Controller.java:21)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
    at java.base/java.lang.Class.newInstance(Class.java:584)
    at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:936)
    at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:980)
    at javafx.fxml/javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:227)
    at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:752)
    at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
    ... 14 more
Exception running application shop.Main