diff --git a/Engine/src/Core/Application.cpp b/Engine/src/Core/Application.cpp
index fbbc7c5..83d5717 100644
--- a/Engine/src/Core/Application.cpp
+++ b/Engine/src/Core/Application.cpp
@@ -54,6 +54,8 @@ namespace Engine {
             m_Renderer->GetDevice().GetDevice().waitIdle();
         }
 
+        if (m_ImGuiLayer) m_ImGuiLayer.reset();
+
         Logger::Shutdown();
     }
 
@@ -106,16 +108,16 @@ namespace Engine {
             m_Scene->FlushDestroyQueue();
             m_Scene->UpdateTransforms();   // UE transform-update 阶段：渲染前保证 world 新鲜
 
-            const auto uiStart = std::chrono::steady_clock::now();
 
             // ---- UI 构建段：OnRenderOverlay 只"声明"控件，不直接碰 GPU ----
             if (m_ImGuiLayer && m_ImGuiLayer->IsEnabled())
             {
+                const auto uiStart = std::chrono::steady_clock::now();
                 m_ImGuiLayer->NewFrame();
                 OnRenderOverlay();
                 m_ImGuiLayer->BuildDrawData();
+                const auto uiEnd = std::chrono::steady_clock::now();
             }
-            const auto uiEnd = std::chrono::steady_clock::now();
 
             // ---- 主渲染（框架行为）：RG 顺序 Forward → ImGui(loadOp=Load) →
             //      Present，draw data 在 ImGui pass 里才真正提交 GPU ----