diff --git a/BossMod/Debug/DebugCollision.cs b/BossMod/Debug/DebugCollision.cs
index 157bc01d10..173c37d906 100644
--- a/BossMod/Debug/DebugCollision.cs
+++ b/BossMod/Debug/DebugCollision.cs
@@ -9,7 +9,7 @@
 
 namespace BossMod;
 
-public unsafe class DebugCollision() : IDisposable
+public sealed unsafe class DebugCollision() : IDisposable
 {
     private readonly UITree _tree = new();
     private BitMask _shownLayers = new(1);
@@ -46,7 +46,6 @@ private static readonly (int, int)[] _boxEdges =
 
     public void Dispose()
     {
-
     }
 
     public void Draw()
diff --git a/BossMod/Util/UITree.cs b/BossMod/Util/UITree.cs
index 1e48e0f8ed..dd1c25a92a 100644
--- a/BossMod/Util/UITree.cs
+++ b/BossMod/Util/UITree.cs
@@ -32,8 +32,6 @@ public void Dispose()
         }
     }
 
-    private uint _selectedID;
-
     // contains 0 elements (if node is closed) or single null (if node is opened)
     // expected usage is 'foreach (_ in Node(...)) { draw subnodes... }'
     public IEnumerable<object?> Node(string text, bool leaf = false, uint color = 0, Action? contextMenu = null, Action? doubleClick = null, Action? select = null)
@@ -84,7 +82,7 @@ private bool RawNode(string text, bool leaf, uint color, Action? contextMenu, Ac
     {
         var id = ImGui.GetID(text);
         var flags = ImGuiTreeNodeFlags.None;
-        if (id == _selectedID)
+        if (id == _selectedId)
             flags |= ImGuiTreeNodeFlags.Selected;
         if (leaf)
             flags |= ImGuiTreeNodeFlags.Leaf;
@@ -95,7 +93,7 @@ private bool RawNode(string text, bool leaf, uint color, Action? contextMenu, Ac
         ImGui.PopStyleColor();
         if (ImGui.IsItemClicked(ImGuiMouseButton.Left))
         {
-            _selectedID = id;
+            _selectedId = id;
             select?.Invoke();
         }
         if (doubleClick != null && ImGui.IsItemHovered() && ImGui.IsMouseDoubleClicked(ImGuiMouseButton.Left))