Can not insert null Guid in Creatio instance running in PostgreSQL

Hello Team,

I am trying to insert a null guid directly to the DB. I use the following snippet

	QueryColumnExpression nullParameter =
					Column.Parameter(DBNull.Value, new GuidDataValueType(UserConnection.DataValueTypeManager));
				update.Set("ResponseDetailsId", nullParameter);

I get the following exception

System.NotSupportedException: The CLR type Terrasoft.Core.DB.QueryColumnExpression isn't supported by Npgsql or your PostgreSQL. If you wish to map it to a PostgreSQL composite type you need to register it before usage, please refer to the documentation.

 

If this is not a suitable way, which is the proper way to insert a null guid directly in a PostgreSQL db from C# code ?