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Invalid MySql query: select
phpclass_ad as a,
phpclass_category as c,
phpclass_user as u
a.ad_id IN (SELECT obce_id from phpclass_ad where ad_owner=399 AND ad_link='lista_projektow') AND
a.ad_owner in ()
You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')' at line 17