diff --git a/src/sql/session/ob_basic_session_info.cpp b/src/sql/session/ob_basic_session_info.cpp
index eef989890..153d64542 100644
--- a/src/sql/session/ob_basic_session_info.cpp
+++ b/src/sql/session/ob_basic_session_info.cpp
@@ -4064,7 +4064,7 @@ int ObBasicSessionInfo::deserialize_sync_sys_vars(int64_t &deserialize_sys_var_c
       }
     }
     if (OB_SUCC(ret) && !is_error_sync) {
-      if (OB_FAIL(sync_default_sys_vars(sys_var_inc_info_, tmp_sys_var_inc_info,
+      if (OB_FAIL(sync_default_sys_vars(tmp_sys_var_inc_info,
                                         is_influence_plan_cache_sys_var))) {
         LOG_WARN("fail to sync default sys vars",K(ret));
       } else if (OB_FAIL(sys_var_inc_info_.assign(tmp_sys_var_inc_info))) {
@@ -4087,8 +4087,7 @@ int ObBasicSessionInfo::deserialize_sync_sys_vars(int64_t &deserialize_sys_var_c
 }
 
 // Deserialization scenario, synchronization of default system variables
-int ObBasicSessionInfo::sync_default_sys_vars(SysVarIncInfo sys_var_inc_info_,
-                                              SysVarIncInfo tmp_sys_var_inc_info,
+int ObBasicSessionInfo::sync_default_sys_vars(SysVarIncInfo &tmp_sys_var_inc_info,
                                               bool &is_influence_plan_cache_sys_var)
 {
   int ret = OB_SUCCESS;
@@ -4121,6 +4120,8 @@ int ObBasicSessionInfo::sync_default_sys_vars(SysVarIncInfo sys_var_inc_info_,
         LOG_TRACE("sync sys var set default value", K(sys_var_id),
         K(sessid_), K(proxy_sessid_));
       }
+    } else if (OB_FAIL(tmp_sys_var_inc_info.add_sys_var_id(sys_var_id))) {
+      LOG_WARN("fail to add sys var id", K(sys_var_id), K(ret));
     }
   }
 
diff --git a/src/sql/session/ob_basic_session_info.h b/src/sql/session/ob_basic_session_info.h
index f1fa40aef..e5d3d9e49 100644
--- a/src/sql/session/ob_basic_session_info.h
+++ b/src/sql/session/ob_basic_session_info.h
@@ -1297,7 +1297,7 @@ public:
   int serialize_sync_sys_vars(common::ObIArray<share::ObSysVarClassType> &sys_var_delta_ids, char *buf, const int64_t &buf_len, int64_t &pos);
   int deserialize_sync_sys_vars(int64_t &deserialize_sys_var_count, const char *buf, const int64_t &data_len, int64_t &pos, bool is_error_sync = false);
   int deserialize_sync_error_sys_vars(int64_t &deserialize_sys_var_count, const char *buf, const int64_t &data_len, int64_t &pos);
-  int sync_default_sys_vars(SysVarIncInfo sys_var_inc_info_, SysVarIncInfo tmp_sys_var_inc_info, bool &is_influence_plan_cache_sys_var);
+  int sync_default_sys_vars(SysVarIncInfo &tmp_sys_var_inc_info, bool &is_influence_plan_cache_sys_var);
   int get_sync_sys_vars(common::ObIArray<share::ObSysVarClassType> &sys_var_delta_ids) const;
   int get_error_sync_sys_vars(ObIArray<share::ObSysVarClassType> &sys_var_delta_ids) const;
   int get_sync_sys_vars_size(common::ObIArray<share::ObSysVarClassType> &sys_var_delta_ids, int64_t &len) const;