diff --git a/comfy/sd.py b/comfy/sd.py
index 6411bb27d..de4eee96e 100644
--- a/comfy/sd.py
+++ b/comfy/sd.py
@@ -1330,7 +1330,7 @@ def load_diffusion_model_state_dict(sd, model_options={}, metadata=None):
     else:
         unet_dtype = dtype
 
-    if hasattr(model_config, "layer_quant_config"):
+    if model_config.layer_quant_config is not None:
         manual_cast_dtype = model_management.unet_manual_cast(None, load_device, model_config.supported_inference_dtypes)
     else:
         manual_cast_dtype = model_management.unet_manual_cast(unet_dtype, load_device, model_config.supported_inference_dtypes)