diff --git a/Editor/Inspector/Menu/MenuPreviewGUI.cs b/Editor/Inspector/Menu/MenuPreviewGUI.cs
index 9a2fe0ab..bd3e4e25 100644
--- a/Editor/Inspector/Menu/MenuPreviewGUI.cs
+++ b/Editor/Inspector/Menu/MenuPreviewGUI.cs
@@ -212,7 +212,10 @@ namespace nadena.dev.modular_avatar.core.editor
                                 var newChild = new GameObject();
                                 newChild.name = "New item";
                                 newChild.transform.SetParent(nodesUnder.root.transform, false);
-                                newChild.AddComponent<ModularAvatarMenuItem>();
+
+                                var mami = newChild.AddComponent<ModularAvatarMenuItem>();
+                                mami.InitSettings();
+
                                 Undo.RegisterCreatedObjectUndo(newChild, "Added menu item");
                             }
 
@@ -223,13 +226,12 @@ namespace nadena.dev.modular_avatar.core.editor
                                 newChild.transform.SetParent(nodesUnder.root.transform, false);
                                 
                                 var mami = newChild.AddComponent<ModularAvatarMenuItem>();
+                                mami.InitSettings();
                                 mami.Control = new VRCExpressionsMenu.Control()
                                 {
                                     type = VRCExpressionsMenu.Control.ControlType.Toggle,
                                     value = 1,
                                 };
-                                mami.isSaved = true;
-                                mami.isSynced = true;
 
                                 newChild.AddComponent<ModularAvatarObjectToggle>();
 
diff --git a/Editor/Inspector/Menu/ToggleCreatorShortcut.cs b/Editor/Inspector/Menu/ToggleCreatorShortcut.cs
index 56105421..dfd18712 100644
--- a/Editor/Inspector/Menu/ToggleCreatorShortcut.cs
+++ b/Editor/Inspector/Menu/ToggleCreatorShortcut.cs
@@ -40,7 +40,10 @@ namespace nadena.dev.modular_avatar.core.editor
             var objToggle = toggle.AddComponent<ModularAvatarObjectToggle>();
 
             toggle.transform.SetParent(parent, false);
-            toggle.AddComponent<ModularAvatarMenuItem>().Control = new VRCExpressionsMenu.Control
+
+            var mami = toggle.AddComponent<ModularAvatarMenuItem>();
+            mami.InitSettings();
+            mami.Control = new VRCExpressionsMenu.Control
             {
                 type = VRCExpressionsMenu.Control.ControlType.Toggle,
                 name = "New Toggle",
diff --git a/Runtime/ModularAvatarMenuItem.cs b/Runtime/ModularAvatarMenuItem.cs
index 13b88e08..e38023ee 100644
--- a/Runtime/ModularAvatarMenuItem.cs
+++ b/Runtime/ModularAvatarMenuItem.cs
@@ -50,6 +50,16 @@ namespace nadena.dev.modular_avatar.core
         public bool automaticValue;
 
         private void Reset()
+        {
+            // Init settings only when added or reset manually from the Inspector.
+            // Otherwise, some plugins that add this component may break in non-playmode builds.
+            if (RuntimeUtil.IsResetFromInspector())
+            {
+                InitSettings();
+            }
+        }
+
+        internal void InitSettings()
         {
             Control = new VRCExpressionsMenu.Control();
             Control.type = VRCExpressionsMenu.Control.ControlType.Toggle;
diff --git a/Runtime/ModularAvatarMergeAnimator.cs b/Runtime/ModularAvatarMergeAnimator.cs
index b48b4100..da3a7412 100644
--- a/Runtime/ModularAvatarMergeAnimator.cs
+++ b/Runtime/ModularAvatarMergeAnimator.cs
@@ -54,6 +54,16 @@ namespace nadena.dev.modular_avatar.core
         }
 
         private void Reset()
+        {
+            // Init settings only when added or reset manually from the Inspector.
+            // Otherwise, some plugins that add this component may break in non-playmode builds.
+            if (RuntimeUtil.IsResetFromInspector())
+            {
+                InitSettings();
+            }
+        }
+
+        internal void InitSettings()
         {
             deleteAttachedAnimator = true;
         }
diff --git a/Runtime/RuntimeUtil.cs b/Runtime/RuntimeUtil.cs
index c5b6f9a3..7ff411f8 100644
--- a/Runtime/RuntimeUtil.cs
+++ b/Runtime/RuntimeUtil.cs
@@ -23,7 +23,7 @@
  */
 
 using System;
-using System.Collections.Generic;
+using System.Linq;
 using JetBrains.Annotations;
 using UnityEngine;
 
@@ -161,5 +161,32 @@ namespace nadena.dev.modular_avatar.core
         {
             OnHierarchyChanged?.Invoke();
         }
+
+#if UNITY_EDITOR
+        private static readonly Type addComponentWindowType = Type.GetType("UnityEditor.AddComponent.AddComponentWindow, UnityEditor");
+#endif
+
+        public static bool IsResetFromInspector(int skipStackFrames = 1)
+        {
+#if !UNITY_EDITOR
+            return false;
+#else
+            var frames = new System.Diagnostics.StackTrace(skipStackFrames).GetFrames();
+
+            // Reset from component context menu
+            if (frames.Length == 1)
+            {
+                return true;
+            }
+
+            // Added from Add Component button
+            if (frames.Any(x => x.GetMethod().DeclaringType == addComponentWindowType))
+            {
+                return true;
+            }
+
+            return false;
+#endif
+        }
     }
 }
\ No newline at end of file