diff --git a/CMakeLists.txt b/CMakeLists.txt
index 175469e..96f4664 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
 
-project(UECS VERSION 0.10.5)
+project(UECS VERSION 0.10.7)
 message(STATUS "[Project] ${PROJECT_NAME}")
 
 include(cmake/InitUCMake.cmake)
diff --git a/include/UECS/ChunkView.h b/include/UECS/ChunkView.h
index fd204d8..d6c3c13 100644
--- a/include/UECS/ChunkView.h
+++ b/include/UECS/ChunkView.h
@@ -17,6 +17,7 @@ namespace Ubpa::UECS {
 		void* GetCmptArray(CmptType) const;
 		template<typename Cmpt>
 		Cmpt* GetCmptArray() const { return reinterpret_cast<Cmpt*>(GetCmptArray(CmptType::Of<Cmpt>)); }
+		const Entity* GetEntityArray() const { return GetCmptArray<Entity>(); }
 		size_t EntityNum() const;
 
 	private:
diff --git a/include/UECS/CmptsView.h b/include/UECS/CmptsView.h
index 0b92213..c9499f3 100644
--- a/include/UECS/CmptsView.h
+++ b/include/UECS/CmptsView.h
@@ -12,7 +12,7 @@ namespace Ubpa::UECS {
 	// use CmptsView::Iterator to read CmptPtr
 	class CmptsView {
 	public:
-		CmptsView(EntityLocator* locator, void** cmpts)
+		CmptsView(const EntityLocator* locator, void** cmpts)
 			: locator{ locator }, cmpts{ cmpts }{}
 
 		// check AccessMode
@@ -35,7 +35,7 @@ namespace Ubpa::UECS {
 
 		void* const* Components() const noexcept { return cmpts; }
 	private:
-		EntityLocator* locator;
+		const EntityLocator* locator;
 		void* const* cmpts;
 	};
 }
diff --git a/src/core/Archetype.cpp b/src/core/Archetype.cpp
index a487cc3..95cc4a6 100644
--- a/src/core/Archetype.cpp
+++ b/src/core/Archetype.cpp
@@ -192,7 +192,7 @@ size_t Archetype::Erase(size_t idx) {
 	size_t dstIdxInChunk = idx % chunkCapacity;
 	byte* dstBuffer = chunks[idx / chunkCapacity]->Data();
 
-	size_t movedIdx = size_t_invalid;
+	size_t movedIdx;
 	
 	if (idx != entityNum - 1) {
 		size_t movedIdxInArchetype = entityNum - 1;
@@ -207,13 +207,15 @@ size_t Archetype::Erase(size_t idx) {
 			byte* src = srcBuffer + offset + srcIdxInChunk * size;
 
 			if (type.Is<Entity>())
-				movedIdx = reinterpret_cast<Entity*>(dst)->Idx();
+				movedIdx = reinterpret_cast<Entity*>(src)->Idx();
 
 			cmptTraits.MoveAssign(type, dst, src);
 			cmptTraits.Destruct(type, src);
 		}
 	}
 	else {
+		movedIdx = size_t_invalid;
+
 		for (auto type : types) {
 			auto size = cmptTraits.Sizeof(type);
 			auto offset = Offsetof(type);