Fehler bim Anlegen eines neuen RSS-Feeds

PDOException: SQLSTATE[HY000]: General error: 1364 Field 'link' doesn't have a default value: INSERT INTO {aggregator_feed} (title, url, refresh, block, description, image) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5); Array ( [:db_insert_placeholder_0] => Test [:db_insert_placeholder_1] => http://www.wn.de/rss/feed/wn_welt_politik [:db_insert_placeholder_2] => 3600 [:db_insert_placeholder_3] => 5 [:db_insert_placeholder_4] => [:db_insert_placeholder_5] => ) in aggregator_save_feed() (Zeile 540 von /is/htdocs/wp11021969_xxxxxxxx/www/homepage/modules/aggregator/aggregator.module).