Output has NaN

[ZhongliangGuo]

Hi, I tried the pipe with several images, I found that, when the image has a white background, the pipe may output a black image. There is a warning like: "diffusers/image_processor.py:97: RuntimeWarning: invalid value encountered in cast images = (images * 255).round().astype("uint8")"

I think that maybe the pipe output a value where not a number? I attached the example image, whatever the random seed I used, it always return a black image. (including my 2 servers, 2 pc, and your hugging face demo)

Could you please help me to solve this problem? I have the same environment as your requirements.txt.