diff --git a/modules/processing_diffusers.py b/modules/processing_diffusers.py
index 46498ef4f..13be1752e 100644
--- a/modules/processing_diffusers.py
+++ b/modules/processing_diffusers.py
@@ -317,7 +317,7 @@ def process_diffusers(p: StableDiffusionProcessing, seeds, prompts, negative_pro
         return results
 
     # optional hires pass
-    latent_scale_mode = shared.latent_upscale_modes.get(p.hr_upscaler, None) if p.hr_upscaler is not None else shared.latent_upscale_modes.get(shared.latent_upscale_default_mode, "None")
+    latent_scale_mode = shared.latent_upscale_modes.get(p.hr_upscaler, None) if (hasattr(p, "hr_upscaler") and p.hr_upscaler is not None) else shared.latent_upscale_modes.get(shared.latent_upscale_default_mode, "None")
     if p.is_hr_pass:
         p.init_hr()
         if p.width != p.hr_upscale_to_x or p.height != p.hr_upscale_to_y: