Why is the bounding box is empty

Software C++
1

In our implementation, with C++, we are seeing many cases where the bounding box is empty. When this problem starts happening, every other grab of the image results in an empty bounding box, with a null Z value.

What is the best way to find out why the bounding box is null?

ZED Model : ZED 2i
ZED SDK Version : 4.2.5

Here is a snippet of the code:

for (auto obj : mObjects.object_list)
{
if (obj.position.z < minZ || obj.position.z > maxZ)
{
if (verboseLog)
{
spdlog::info(“Object Z value is {}”, obj.position.z);
}
continue;
}
if (obj.confidence < minConfidence)
{
if (verboseLog)
{
spdlog::info(“Object confidence is {}”, obj.confidence);
}
continue;
}
if (obj.id < 0)
{
if (verboseLog)
{
spdlog::info(“Object ID {}”, obj.id);
}
continue;
}

    if (obj.bounding_box.empty())
    {
        spdlog::info("Object bounding_box is empty");
    }
    if (obj.bounding_box_2d.empty())
    {
        spdlog::info("Object bounding_box_2d is empty");
    }

   if (!obj.bounding_box.empty())
    {
        // Where the target is going to be in the next frame
        float nextMinX = obj.bounding_box[0].x + static_cast<float>(msDelay) / 1000 * obj.velocity.x;
        float nextMaxX = obj.bounding_box[3].x + static_cast<float>(msDelay) / 1000 * obj.velocity.x;

        float width = obj.bounding_box_2d[2].x - obj.bounding_box_2d[0].x;
        float height = obj.bounding_box_2d[2].y - obj.bounding_box_2d[0].y;

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