diff --git a/modules/devices.py b/modules/devices.py
index 0321d12c6..370286297 100644
--- a/modules/devices.py
+++ b/modules/devices.py
@@ -165,6 +165,8 @@ def manual_cast_forward(target_dtype):
 @contextlib.contextmanager
 def manual_cast(target_dtype):
     for module_type in patch_module_list:
+        if hasattr(module_type, "org_forward"):
+            continue
         org_forward = module_type.forward
         if module_type == torch.nn.MultiheadAttention and has_xpu():
             module_type.forward = manual_cast_forward(torch.float32)
@@ -175,7 +177,9 @@ def manual_cast(target_dtype):
         yield None
     finally:
         for module_type in patch_module_list:
-            module_type.forward = module_type.org_forward
+            if hasattr(module_type, "org_forward"):
+                module_type.forward = module_type.org_forward
+                delattr(module_type, "org_forward")
 
 
 def autocast(disable=False):