diff --git a/Editor/ReactiveObjects/ShapeChangerPreview.cs b/Editor/ReactiveObjects/ShapeChangerPreview.cs
index d17c7a37..2ca011c7 100644
--- a/Editor/ReactiveObjects/ShapeChangerPreview.cs
+++ b/Editor/ReactiveObjects/ShapeChangerPreview.cs
@@ -101,6 +101,7 @@ namespace nadena.dev.modular_avatar.core.editor
 
                 var activeRule = prop.actionGroups.LastOrDefault(rule => rule.InitiallyActive);
                 if (activeRule == null || activeRule.Value is not float value) continue;
+                if (activeRule.ControllingObject == null) continue; // default value is being inherited
 
                 value = Math.Clamp(value, 0, 100);