(Updated)
The last line of vae_tile_forward (vae_optimize.py line 650) is
return result if result is not None else result_approx.to(device)
When you interrupt the generation using HiRes fix (click Interrupt in the webui), an exception is thrown from this line,
File "stable-diffusion-webui/extensions/multidiffusion-upscaler-for-automatic1111/scripts/vae_optimize.py", line 650, in vae_tile_forward
return result if result is not None else result_approx.to(device)
AttributeError: 'NoneType' object has no attribute 'to'
(Updated) The last line of vae_tile_forward (vae_optimize.py line 650) is
return result if result is not None else result_approx.to(device)
When you interrupt the generation using HiRes fix (click Interrupt in the webui), an exception is thrown from this line,