diff --git a/projects/clr/hipamd/src/hip_graph_internal.hpp b/projects/clr/hipamd/src/hip_graph_internal.hpp
index fbce571246..2cbefb6238 100644
--- a/projects/clr/hipamd/src/hip_graph_internal.hpp
+++ b/projects/clr/hipamd/src/hip_graph_internal.hpp
@@ -88,6 +88,7 @@ struct UserObject : public amd::ReferenceCountedObject {
   }
 
   static bool isUserObjvalid(UserObject* pUsertObj) {
+    amd::ScopedLock lock(UserObjectLock_);
     auto it = ObjectSet_.find(pUsertObj);
     if (it == ObjectSet_.end()) {
       return false;