I have this code to move around the image when dragging but when I reach one of the image limits it returns the following error

Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in cv::Mat::Mat, file C:GHA-OCV-1_workci-gha-workflowci-gha-workflowopencvmodulescoresrc matrix.cpp, line 809

Mat originalImage;
Mat currentImage;

bool isDragging = false;

Point startPoint;
Point lastMousePos;
Rect viewportRect(0, 0, 1000, 500);


void updateImage() {
    Mat tempImage = originalImage.clone();
    Mat viewport = tempImage(viewportRect);
    currentImage = viewport.clone();
    imshow("Drawing", currentImage);
}


static void drawCallback(int event, int x, int y, int flags, void* param) {
    switch (event) {
    case EVENT_LBUTTONDOWN:
        if (flags & EVENT_FLAG_SHIFTKEY) {
            isDragging = true;
            startPoint = Point(x, y);
            lastMousePos = startPoint;
        }
        break;
    case EVENT_MOUSEMOVE:
        if (isDragging) {
            int dx = x - lastMousePos.x;
            int dy = y - lastMousePos.y;
            viewportRect.x -= dx;
            viewportRect.y -= dy;
            lastMousePos = Point(x, y);
            updateImage();
        }
        break;
    case EVENT_LBUTTONUP:
        isDragging = false;
        break;
    }
}

int main()
{
    string imagePath = "C:/Users/Yuri/Pictures/space.jpg";

    originalImage = imread(imagePath, IMREAD_COLOR);

    currentImage = originalImage.clone();

    namedWindow("Drawing");

    updateImage();

    setMouseCallback("Drawing", drawCallback, nullptr);

    while (1) {
        imshow("Drawing", currentImage);
        int key = waitKey(0);
        if (key == 27)
            break;
    }

    destroyAllWindows();
    return 0;
}

*I’m using currentImage because it will be useful later

I imagine there is a problem with showing something outside the limits of the image since there is nothing there, but I have no idea how to fix it.