diff --git a/inc/hgl/graph/VKMaterialDescriptorSets.h b/inc/hgl/graph/VKMaterialDescriptorSets.h
index de80f852..13be4a16 100644
--- a/inc/hgl/graph/VKMaterialDescriptorSets.h
+++ b/inc/hgl/graph/VKMaterialDescriptorSets.h
@@ -9,9 +9,6 @@ class MaterialDescriptorSets
 {
     UTF8String mtl_name;
 
-    ShaderDescriptor *sd_list;
-    uint sd_count;
-
     //ShaderDescriptorList sd_list_by_set_type[size_t(DescriptorSetType::RANGE_SIZE)];
     bool set_has_desc[size_t(DescriptorSetType::RANGE_SIZE)];
 
diff --git a/src/SceneGraph/Vulkan/VKMaterialDescriptorSets.cpp b/src/SceneGraph/Vulkan/VKMaterialDescriptorSets.cpp
index 191dd4d4..d28f8ea4 100644
--- a/src/SceneGraph/Vulkan/VKMaterialDescriptorSets.cpp
+++ b/src/SceneGraph/Vulkan/VKMaterialDescriptorSets.cpp
@@ -12,13 +12,10 @@ void WriteDescriptorSetLayoutBinding(VkDescriptorSetLayoutBinding *dslb,ShaderDe
     dslb->pImmutableSamplers=nullptr;
 }
 
-MaterialDescriptorSets::MaterialDescriptorSets(const UTF8String &name,ShaderDescriptor *sd,const uint count)
+MaterialDescriptorSets::MaterialDescriptorSets(const UTF8String &name,ShaderDescriptor *sd_list,const uint sd_count)
 {
     mtl_name=name;
 
-    sd_list=sd;
-    sd_count=count;
-
     if(sd_count<=0)return;
 
     ShaderDescriptorList sd_list_by_desc_type[VK_DESCRIPTOR_TYPE_RANGE_SIZE];
@@ -105,8 +102,6 @@ MaterialDescriptorSets::~MaterialDescriptorSets()
         if(dsl_ci[i].bindingCount)
             delete[] dsl_ci[i].pBindings;
 
-    delete[] sd_list;       //"delete[] nullptr" isn't bug.
-
     //for(uint i=VK_DESCRIPTOR_TYPE_BEGIN_RANGE;
     //        i<=VK_DESCRIPTOR_TYPE_END_RANGE;i++)
     //{
diff --git a/src/SceneGraph/Vulkan/VKRenderResourceMaterial.cpp b/src/SceneGraph/Vulkan/VKRenderResourceMaterial.cpp
index 6dcbae6d..a8c55ee7 100644
--- a/src/SceneGraph/Vulkan/VKRenderResourceMaterial.cpp
+++ b/src/SceneGraph/Vulkan/VKRenderResourceMaterial.cpp
@@ -177,6 +177,8 @@ Material *RenderResource::CreateMaterial(const OSString &filename)
             LoadShaderDescriptor(cbr,sd_list,count,ver);
         
             mds=new MaterialDescriptorSets(mtl_name,sd_list,count);
+
+            delete[] sd_list;
         }
     }