diff --git a/src/sql/session/ob_basic_session_info.cpp b/src/sql/session/ob_basic_session_info.cpp
index 7d3777ee90..168a292273 100644
--- a/src/sql/session/ob_basic_session_info.cpp
+++ b/src/sql/session/ob_basic_session_info.cpp
@@ -2018,6 +2018,9 @@ int ObBasicSessionInfo::sys_variable_exists(const ObString &var, bool &is_exists
     LOG_ERROR("got store_idx is invalid", K(store_idx), K(ret));
   } else {
     is_exists = (NULL != sys_vars_[store_idx]);
+    if (NULL != sys_vars_[store_idx]) {
+      is_exists = !sys_vars_[store_idx]->is_base_value_empty();
+    }
   }
   return ret;
 }