insightface-faceid extract None

When I used the insightface module to extract faceids from the ffhq and celeba data sets, I found that face IDs could be extracted from 70,000 faces in ffhq, but face IDs could not be extracted (faces result is None: []) from more than 1,000 faces in the celeba data set. What should I do?
Some uploaded faces could not extract faceid. It seemed that some changes could be worked (such as sharpen, crop), but there was no unified method suitable for all images. If you can provide some ideas, thank you very much!