// +++ new line to code in line 507
    $data[] = $table;      // first elemeint in data array is the table name
    
    foreach ($obj_def['columns'] as $column => $attrib) {
      $column_names[] = $column;
      $placeholder = isset($attrib['data type']) ? $col_type_map[$attrib['data type']] : "'%s'";
      $column_placeholders[] = $placeholder;
      $column_assignments[] = $column .' = '. $placeholder;
      $data[] = $obj->$column;
    }
    $data[] = $obj->$id_name;
    if ($obj->is_new) {
      // --- change this line:
      db_query("INSERT INTO {$table} (". implode(', ', $column_names) .", $id_name) VALUES (". implode(', ', $column_placeholders) .', %d)', $data);

      // +++ to this line
      db_query("INSERT INTO {%s} (". implode(', ', $column_names) .", $id_name) VALUES (". implode(', ', $column_placeholders) .', %d)', $data);
    }
    else {
      // --- change this line:
      db_query("UPDATE {$table} SET ". implode(', ', $column_assignments) ." WHERE $id_name = %d", $data);

      // +++ to this line
      db_query("UPDATE {%s} SET ". implode(', ', $column_assignments) ." WHERE $id_name = %d", $data);
    }