Drupal 4.7
Agg2 CVS 4/26/06

I'm getting a lot of these errors in my log during cron updates

Duplicate entry '1-30' for key 1 query: INSERT INTO term_node (nid, tid) VALUES (30, 1) in /home/.needle/user/mysite.net/includes/database.mysqli.inc on line 121.

advice please

thanks