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Cuda ORB Descriptors problem

I am trying to make a feature matching algorithm with OpenCV on CUDA. I am using the ORB features. The main problem I have is that I am able to well compute the ORB keypoints but the descriptors are always empty. I tried all the ways but without success. I tried with the last version of opencv (3.4.0) and the 3.2.0 version. This is the simplified version of my code:

cv::Ptr<cv::cuda::ORB> orb_gpu = cv::cuda::ORB::create(5000);
std::vector<cv::KeyPoint> keypoints;
cv::cuda::GpuMat descriptors;
cv::cuda::GpuMat img_gpu(curr_frame);
orb_gpu->detect(img_gpu, keypoints); 
orb_gpu->compute(img_gpu, keypoints, descriptors);
cv::Mat desc_cpu;