From 3fe61cedda090c744dcf6f579ed48744fa66ef5f Mon Sep 17 00:00:00 2001
From: rattus <46076784+rattus128@users.noreply.github.com>
Date: Wed, 11 Feb 2026 11:54:02 -0800
Subject: [PATCH] model_patcher: guard against none model_dtype (#12410)

Handle the case where the _model_dtype exists but is none with the
intended fallback.
---
 comfy/model_patcher.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/comfy/model_patcher.py b/comfy/model_patcher.py
index 224e218e3..f278fccac 100644
--- a/comfy/model_patcher.py
+++ b/comfy/model_patcher.py
@@ -1525,7 +1525,7 @@ class ModelPatcherDynamic(ModelPatcher):
                     setattr(m, param_key + "_function", weight_function)
                     geometry = weight
                     if not isinstance(weight, QuantizedTensor):
-                        model_dtype = getattr(m, param_key + "_comfy_model_dtype", weight.dtype)
+                        model_dtype = getattr(m, param_key + "_comfy_model_dtype", None) or weight.dtype
                         weight._model_dtype = model_dtype
                         geometry = comfy.memory_management.TensorGeometry(shape=weight.shape, dtype=model_dtype)
                     return comfy.memory_management.vram_aligned_size(geometry)
@@ -1551,7 +1551,7 @@ class ModelPatcherDynamic(ModelPatcher):
                         weight.seed_key = key
                         set_dirty(weight, dirty)
                         geometry = weight
-                        model_dtype = getattr(m, param + "_comfy_model_dtype", weight.dtype)
+                        model_dtype = getattr(m, param + "_comfy_model_dtype", None) or weight.dtype
                         geometry = comfy.memory_management.TensorGeometry(shape=weight.shape, dtype=model_dtype)
                         weight_size = geometry.numel() * geometry.element_size()
                         if vbar is not None and not hasattr(weight, "_v"):