Bound must be positive when add a list?

My categories list doesn't empty but when I call fake product API, it return: "message": "bound must be positive". Maybe the random made these errors? I don't know why. Help me, please!

    @GetMapping("/fake")
    public BaseAPI fakeProducts() {
        BaseAPI baseAPI = new BaseAPI();
        try {
            long totalproducts = productService.getTotalProducts();
            List<Product> productList = new ArrayList<>();
            List<Category> categoryList = new ArrayList<>();
            Random random = new Random();
            for (long i = totalproducts+1; i <= totalproducts + 10; i++)
            {
                Product product = new Product();
                product.setName("Product" +i);
                product.setPrice(prices[random.nextInt(prices.length)]);
                product.setMainImage(images[random.nextInt(images.length)]);
                product.setSize(sizes[random.nextInt(sizes.length)]);
                product.setDisplay(screens[random.nextInt(screens.length)]);
                product.setOperatorSystem(os[random.nextInt(os.length)]);
                product.setFrontCamera(frontCam[random.nextInt(frontCam.length)]);
                product.setBackCamera(backCam[random.nextInt(backCam.length)]);
                product.setCategory(categoryList.get(random.nextInt(categoryList.size())));
                product.setCreatedDate(new Date());
                productList.add(product);
            }
            productService.addListProducts(productList);
            baseAPI.setMessage("success");
        }catch (Exception e) {
            baseAPI.setMessage(e.getMessage());
        }
        return baseAPI;
    }