WordPress databasefout: [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 ') AND meta_key IN ('attribute_doelgroep','attribute_aantal-personen-voor-s...' at line 3]
SELECT post_id as variation_id, meta_key as attribute_key, meta_value as attribute_value FROM wp_postmeta WHERE post_id IN () AND meta_key IN ('attribute_doelgroep','attribute_aantal-personen-voor-sessie')

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