diff --git a/comfy/controlnet.py b/comfy/controlnet.py
index 73a40acfa..f1355e64e 100644
--- a/comfy/controlnet.py
+++ b/comfy/controlnet.py
@@ -416,7 +416,7 @@ class T2IAdapter(ControlBase):
                 if control_prev is not None:
                     return control_prev
                 else:
-                    return {}
+                    return None
 
         if self.cond_hint is None or x_noisy.shape[2] * 8 != self.cond_hint.shape[2] or x_noisy.shape[3] * 8 != self.cond_hint.shape[3]:
             if self.cond_hint is not None: