diff --git a/extensions-builtin/sd_forge_controlnet/lib_controlnet/controlnet_ui/controlnet_ui_group.py b/extensions-builtin/sd_forge_controlnet/lib_controlnet/controlnet_ui/controlnet_ui_group.py
index 19a7e9f3..c030c449 100644
--- a/extensions-builtin/sd_forge_controlnet/lib_controlnet/controlnet_ui/controlnet_ui_group.py
+++ b/extensions-builtin/sd_forge_controlnet/lib_controlnet/controlnet_ui/controlnet_ui_group.py
@@ -993,7 +993,7 @@ class ControlNetUiGroup(object):
         )
 
         def fn_canvas(h, w):
-            return np.zeros(shape=(h, w, 3), dtype=np.uint8) + 255, gr.Accordion.update(
+            return np.zeros(shape=(h, w, 3), dtype=np.uint8), gr.Accordion.update(
                 visible=False
             )