diff --git a/lib/db_ido/dbobject.cpp b/lib/db_ido/dbobject.cpp
index c48739ede..28ef722b2 100644
--- a/lib/db_ido/dbobject.cpp
+++ b/lib/db_ido/dbobject.cpp
@@ -234,8 +234,9 @@ void DbObject::SendVarsConfigUpdateHeavy()
 
 			DbQuery query3;
 			query3.Table = "customvariables";
-			query3.Type = DbQueryInsert;
+			query3.Type = DbQueryInsert | DbQueryUpdate;
 			query3.Category = DbCatConfig;
+
 			query3.Fields = new Dictionary({
 				{ "varname", kv.first },
 				{ "varvalue", value },
@@ -244,6 +245,13 @@ void DbObject::SendVarsConfigUpdateHeavy()
 				{ "object_id", obj },
 				{ "instance_id", 0 } /* DbConnection class fills in real ID */
 			});
+
+			query3.WhereCriteria = new Dictionary({
+				{ "object_id", obj },
+				{ "config_type", 1 },
+				{ "varname", kv.first }
+			});
+
 			queries.emplace_back(std::move(query3));
 		}
 	}