diff --git a/Packages/nadena.dev.modular-avatar/Editor/Localization/en.json b/Packages/nadena.dev.modular-avatar/Editor/Localization/en.json
index bf884494..9d0b78de 100644
--- a/Packages/nadena.dev.modular-avatar/Editor/Localization/en.json
+++ b/Packages/nadena.dev.modular-avatar/Editor/Localization/en.json
@@ -94,6 +94,7 @@
   "hint.bad_vrcsdk": "Incompatible version of VRCSDK detected.\n\nPlease try upgrading your VRCSDK; if this does not work, check for a newer version of Modular Avatar as well.",
   "error.stack_trace": "Stack trace (provide this when reporting bugs!)",
   "error.merge_armature.merge_into_self": "Your Merge Armature component is referencing itself, or a child of itself, as the merge target. You should reference the avatar's armature instead. Do not put Merge Armature on the avatar's main armature.",
+  "error.merge_armature.physbone_on_humanoid_bone": "PhysBone is set on the humanoid bone in armature to merge. You should remove PhysBone on the humanoid bone in armature to merge.",
   "error.internal_error": "An internal error has occurred: {0}\nwhen processing:",
   "error.merge_animator.param_type_mismatch": "Parameter {0} has multiple types: {1} != {2}",
   "error.rename_params.too_many_synced_params": "Too many synced parameters: Cost {0} > {1}",
diff --git a/Packages/nadena.dev.modular-avatar/Editor/Localization/ja.json b/Packages/nadena.dev.modular-avatar/Editor/Localization/ja.json
index bc824424..fd26158d 100644
--- a/Packages/nadena.dev.modular-avatar/Editor/Localization/ja.json
+++ b/Packages/nadena.dev.modular-avatar/Editor/Localization/ja.json
@@ -92,6 +92,7 @@
   "hint.bad_vrcsdk": "使用中のVRCSDKのバージョンとは互換性がありません。\n\nVRCSDKを更新してみてください。それでもだめでしたら、Modular Avatarにも最新版が出てないかチェックしてください。",
   "error.stack_trace": "スタックトレース（バグを報告する時は必ず添付してください！）",
   "error.merge_armature.merge_into_self": "Merge Armatureに自分自身のオブジェクト、もしくは自分の子をターゲットにしてしています。かわりにアバターのメインArmatureを指定してください。アバター自体のArmatureに追加しないでください。",
+  "error.merge_armature.physbone_on_humanoid_bone": "統合するArmatureのHumanoidボーンにPhysBoneが設定されています。統合するArmatureのHumanoidボーンからPhysBoneを削除してください。",
   "error.internal_error": "内部エラーが発生しました：{0}\n以下のオブジェクトの処理中に発生しました：",
   "error.merge_animator.param_type_mismatch": "パラメーター {0} に複数の種別が設定されています: {1} != {2}",
   "error.rename_params.too_many_synced_params": "同期パラメーターが多すぎます。コスト{0}が制限値の{1}を超えています。",
diff --git a/Packages/nadena.dev.modular-avatar/Editor/MergeArmatureHook.cs b/Packages/nadena.dev.modular-avatar/Editor/MergeArmatureHook.cs
index f7c0e7bb..989709f0 100644
--- a/Packages/nadena.dev.modular-avatar/Editor/MergeArmatureHook.cs
+++ b/Packages/nadena.dev.modular-avatar/Editor/MergeArmatureHook.cs
@@ -325,10 +325,17 @@ namespace nadena.dev.modular_avatar.core.editor
                             childName.Length - config.prefix.Length - config.suffix.Length);
                         var targetObject = newParent.transform.Find(targetObjectName);
                         // Zip merge bones if the names match and the outfit side is not affected by its own PhysBone.
-                        if (targetObject != null && !IsAffectedByPhysBone(child))
+                        if (targetObject != null)
                         {
-                            childNewParent = targetObject.gameObject;
-                            shouldZip = true;
+                            if (!IsAffectedByPhysBone(child))
+                            {
+                                childNewParent = targetObject.gameObject;
+                                shouldZip = true;
+                            }
+                            else if (IsHumanoidBone(targetObject))
+                            {
+                                BuildReport.LogFatal("error.merge_armature.physbone_on_humanoid_bone", new string[0], config);
+                            }
                         }
                     }
 
@@ -341,5 +348,22 @@ namespace nadena.dev.modular_avatar.core.editor
         {
             return physBones.Any(x => target.IsChildOf(x.GetRootTransform()) && !x.ignoreTransforms.Any(target.IsChildOf));
         }
+
+        private bool IsHumanoidBone(Transform target)
+        {
+            var animator = target.GetComponentInParent<Animator>();
+            if (animator != null)
+            {
+                foreach (HumanBodyBones bone in Enum.GetValues(typeof(HumanBodyBones)))
+                {
+                    if (bone == HumanBodyBones.LastBone) continue;
+                    if (target == animator.GetBoneTransform(bone))
+                    {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
     }
 }
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