When using multisite via Drupal's multisite build-in function I get error:

user warning: Table 'dbnode_sk.it_users' doesn't exist query: SELECT MIN(created) FROM it_users WHERE uid != 0 in /data3/n/o/node.sk/web/includes/database.mysql.inc on line 172.
user warning: Table 'dbnode_sk.it_users' doesn't exist query: SELECT MIN(created) FROM it_users WHERE uid != 0 in /data3/n/o/node.sk/web/includes/database.mysql.inc on line 172.
user warning: Table 'dbnode_sk.it_users' doesn't exist query: SELECT MIN(created) FROM it_users WHERE uid != 0 in /data3/n/o/node.sk/web/includes/database.mysql.inc on line 172.

everytime when i hit "save configuration" on /admin/build/modules or when I visit graphstat page. I assume it's because of a hard link to the users table in database - prefix is ignored.