diff --git a/Engine/Collection/DrawnCollection.cs b/Engine/Collection/DrawnCollection.cs
index 49d7a832..3cba85a6 100644
--- a/Engine/Collection/DrawnCollection.cs
+++ b/Engine/Collection/DrawnCollection.cs
@@ -5,6 +5,7 @@ namespace Altseed2
 {
     internal class DrawnCollection
     {
+        public bool IsCollectionInForeach = false;
         private SortedDictionary<int, HashSet<IDrawn>> _Drawns;
         private SortedDictionary<int, SortedDictionary<int, HashSet<IDrawn>>> _Sorted;
 
@@ -19,6 +20,7 @@ internal DrawnCollection()
         internal void Register(IDrawn node)
         {
             if (node == null) throw new ArgumentNullException(nameof(node));
+            if (IsCollectionInForeach) throw new InvalidOperationException();
 
             {
                 if (!_Drawns.TryGetValue(node.ZOrder, out var set))
@@ -44,6 +46,7 @@ internal void Register(IDrawn node)
         internal void Unregister(IDrawn node)
         {
             if (node == null) throw new ArgumentNullException(nameof(node));
+            if (IsCollectionInForeach) throw new InvalidOperationException();
 
             _Drawns[node.ZOrder].Remove(node);
 
@@ -60,6 +63,7 @@ internal void Unregister(IDrawn node)
         internal void UpdateCameraGroup(IDrawn node, ulong old)
         {
             if (node == null) throw new ArgumentNullException(nameof(node));
+            if (IsCollectionInForeach) throw new InvalidOperationException();
 
             for (int i = 0; i < Engine.MaxCameraGroupCount; i++)
             {
@@ -87,6 +91,7 @@ internal void UpdateCameraGroup(IDrawn node, ulong old)
         internal void UpdateZOrder(IDrawn node, int old)
         {
             if (node == null) throw new ArgumentNullException(nameof(node));
+            if (IsCollectionInForeach) throw new InvalidOperationException();
 
             {
                 _Drawns[old].Remove(node);
diff --git a/Engine/Engine.cs b/Engine/Engine.cs
index 93de5bb4..7a803687 100644
--- a/Engine/Engine.cs
+++ b/Engine/Engine.cs
@@ -184,7 +184,9 @@ internal static bool UpdateComponents(bool drawDefaultCameraGroup, bool drawCust
             if (drawDefaultCameraGroup)
             {
                 // カメラが 1 つもない場合はデフォルトカメラを使用
+                _DrawnCollection.IsCollectionInForeach = true;
                 DrawCameraGroup(_DefaultCamera, _DrawnCollection.GetDrawns());
+                _DrawnCollection.IsCollectionInForeach = false;
             }
 
             if (drawCustomCameraGroup)
@@ -194,7 +196,9 @@ internal static bool UpdateComponents(bool drawDefaultCameraGroup, bool drawCust
                 {
                     foreach (var camera in _CameraNodes[i])
                     {
+                        _DrawnCollection.IsCollectionInForeach = true;
                         DrawCameraGroup(camera.RenderedCamera, _DrawnCollection[i]);
+                        _DrawnCollection.IsCollectionInForeach = false;
                     }
                 }
             }