PDOException

Hello,

I have a problem. I am using the Premium module and the Node Option Premium module (7.x-1.1). When I save a node as an premium node, I receive an error. The database logged the following issue:

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'level_name' cannot be null: INSERT INTO {premium_nodes} (nid, level_name, start_ts, end_ts) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3); Array ( [:db_insert_placeholder_0] => 35833 [:db_insert_placeholder_1] => [:db_insert_placeholder_2] => 0 [:db_insert_placeholder_3] => 0 ) in _premium_set_premium() (Zeile 446 von /xxxxxxxx/sites/all/modules/premium_content/premium.module).

Do you know what is going on there?
Thanks a lot.