diff --git a/Assets/HhotateA/AvatarModifyTool/Editor/AvatarModifyTool.cs b/Assets/HhotateA/AvatarModifyTool/Editor/AvatarModifyTool.cs
index 688253c..350d169 100644
--- a/Assets/HhotateA/AvatarModifyTool/Editor/AvatarModifyTool.cs
+++ b/Assets/HhotateA/AvatarModifyTool/Editor/AvatarModifyTool.cs
@@ -449,6 +449,11 @@ void SetAvatarAnimatorController(AnimatorLayerType type, AnimatorController cont
             avatar.customizeAnimationLayers = true;
             var index = Array.FindIndex(avatar.baseAnimationLayers,
                 l => l.type == type.GetVRChatAnimatorLayerType());
+            if (index == -1)
+            {
+                Debug.LogError("Animation Layers" + type.GetVRChatAnimatorLayerType() + " Not Found");
+                return;
+            }
             avatar.baseAnimationLayers[index].isDefault = false;
             avatar.baseAnimationLayers[index].animatorController = controller;
 #else
@@ -461,6 +466,11 @@ bool GetAvatarAnimatorControllerExists(AnimatorLayerType type)
 #if VRC_SDK_VRCSDK3
             var index = Array.FindIndex(avatar.baseAnimationLayers,
                 l => l.type == type.GetVRChatAnimatorLayerType());
+            if (index == -1)
+            {
+                Debug.LogError("Animation Layers" + type.GetVRChatAnimatorLayerType() + " Not Found");
+                return false;
+            }
             return avatar.baseAnimationLayers[index].animatorController != null;
 #else
             return avatar.runtimeAnimatorController != null;
@@ -540,6 +550,11 @@ Dictionary<AnimatorLayerType, int> ComputeLayersOffset(AvatarModifyData assets)
         int GetLayerOffset(AvatarModifyData assets,AnimatorLayerType type)
         {
             var index = Array.FindIndex(avatar.baseAnimationLayers,l => l.type == type.GetVRChatAnimatorLayerType());
+            if (index == -1)
+            {
+                Debug.LogError("Animation Layers" + type.GetVRChatAnimatorLayerType() + " Not Found");
+                return 0;
+            }
             if (avatar.customizeAnimationLayers == false) return 0;
             if (avatar.baseAnimationLayers[index].isDefault == true) return 0;
             if (!avatar.baseAnimationLayers[index].animatorController) return 0;
diff --git a/Assets/HhotateA/MagicalDresserInventorySystem/Editor/MagicalDresserInventorySetup.cs b/Assets/HhotateA/MagicalDresserInventorySystem/Editor/MagicalDresserInventorySetup.cs
index a2bf8a7..dd7e1d5 100644
--- a/Assets/HhotateA/MagicalDresserInventorySystem/Editor/MagicalDresserInventorySetup.cs
+++ b/Assets/HhotateA/MagicalDresserInventorySystem/Editor/MagicalDresserInventorySetup.cs
@@ -2389,7 +2389,12 @@ Material GetDefaultMaterial(Renderer rend, int index)
                 defaultMaterials.Add(rend,rend.sharedMaterials.ToArray());
             }
 
-            return defaultMaterials[rend][index];
+            if ( 0 <= index && index < defaultMaterials[rend].Length)
+            {            
+                return defaultMaterials[rend][index];
+            }
+
+            return null;
         }
         
         // デフォルトのBlendShape状態(シーン)を記録&取得する