[Bug]: Rendering Black images with sdxl

[LazyCat420]

Is there an existing issue for this?

• I have searched the existing issues and checked the recent builds/commits

What happened?

Rendering images I can see it but when it gets to the last 10% it goes black and the output in the folder is also a black image. I don't get any error messages. Has anyone else run into this problem? Used the sdxl 0.9 base in txt2img.

Steps to reproduce the problem

Settings

a cat driving a cat car, high detail
Negative prompt: ugly, deformed, disfigured
Steps: 40, Sampler: Euler a, CFG scale: 7.5, Seed: 2295296581, Size: 512x512
Model: Everyjourney_SDXL_pruned, Version: v1.5.0

What should have happened?

should have gotten a picture of a cat driving a car.

Version or Commit where the problem happens

Version: v1.5.0

What Python version are you running on ?

Python 3.10.x

What platforms do you use to access the UI ?

Windows

What device are you running WebUI on?

Nvidia GPUs (RTX 20 above)

Cross attention optimization

xformers

What browsers do you use to access the UI ?

Google Chrome

Command Line Arguments

set COMMANDLINE_ARGS= --disable-safe-unpickle --xformers --disable-nan-check

List of extensions

n/a

Console logs

didn't get a error

Additional information

No response

[w-e-w]

don't --disable-nan-check

[maxiy01]

Try using --no-half-vae

[w-e-w]

webui it should auto switch to --no-half-vae (32-bit float) if NaN was detected
and it only checks for NaN when NaN check is not disabled (when not using --disable-nan-check)
this is a new feature in 1.5.0
so only enable --no-half-vae if your device does not support half or for whatever reason NaN happens too often

note some older cards might perform the worst with half the, so in this situations you might want to still use --no-half-vae

[thebongmaster]

I am also getting this issue, running on AMD GPU Radeon RX 6600 with latest SD webui

[allancorrigall]

I am also getting this issue, running on AMD GPU Radeon RX 6600 with latest SD webui

same. I'm on 6800 xt..

[pfeiffee]

I had this exact issue and the remove --disable-nan-check suggestion from @w-e-w solved it for me.

[hansolocambo]

Except with a very small amount of models (Pony XL), every SDXL generates also black images for me. I can see the image but it disappears at the last second and saves a black image.
Been using SD for more than a year without issue. Any advice please ?
i9-2900K, RTX 3090

[w-e-w]

@hansolocambo are you using the sdxl-vae-fp16-fix
https://huggingface.co/madebyollin/sdxl-vae-fp16-fix/blob/main/sdxl_vae.safetensors
xl on fp16 often produced NaN in VAE so if you are using fp16 which is the default when then you should use the fp16 fix vee