diff --git a/libSyntax/ast_novel.cpp b/libSyntax/ast_novel.cpp
index 50fa144..737b532 100644
--- a/libSyntax/ast_novel.cpp
+++ b/libSyntax/ast_novel.cpp
@@ -117,7 +117,7 @@ void example_novel::Document::cacheLoad()
 }
 
 example_novel::AbstractImpl::AbstractImpl(std::shared_ptr<const lib_syntax::ExpressionRule> rule_bind)
-	: ExpressionElement(rule_bind) {}
+	: ExpressionElement(rule_bind) { parent_store.reset(); }
 
 QList<std::shared_ptr<const ast_gen::TokenAccess> > AbstractImpl::selfTokens() const {
 	auto tokensx = ast_basic::ExpressionElement::tokens();
@@ -131,7 +131,7 @@ QList<std::shared_ptr<const ast_gen::TokenAccess> > AbstractImpl::selfTokens() c
 
 std::shared_ptr<const ast_gen::SyntaxElement> example_novel::AbstractImpl::parent() const
 {
-	return this->parent_store;
+	return this->parent_store.lock();
 }
 
 void example_novel::AbstractImpl::setParent(std::shared_ptr<const ast_gen::SyntaxElement> inst)
diff --git a/libSyntax/ast_novel.h b/libSyntax/ast_novel.h
index 411a59e..9fc4859 100644
--- a/libSyntax/ast_novel.h
+++ b/libSyntax/ast_novel.h
@@ -17,7 +17,7 @@ namespace example_novel
 	class LIBSYNTAX_EXPORT AbstractImpl :
 		public ast_basic::ExpressionElement, public ast_gen::SyntaxElement {
 	private:
-		std::shared_ptr<const SyntaxElement> parent_store = nullptr;
+		std::weak_ptr<const SyntaxElement> parent_store;
 
 	public:
 		explicit AbstractImpl(std::shared_ptr<const lib_syntax::ExpressionRule> rule_bind);
diff --git a/报告20240618-1929.diagsession b/报告20240618-1929.diagsession
new file mode 100644
index 0000000..d6e5a0e
Binary files /dev/null and b/报告20240618-1929.diagsession differ