SELECT `id` FROM `papers` WHERE `conference_id`=<br />
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SELECT c.id FROM comments as c LEFT JOIN papers as p on c.paper_id = p.id WHERE p.conference_id=<br />
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<b>Fatal error</b>:  Call to a member function count() on a non-object in <b>/var/www/vhosts/sciforum.net/httpdocs/classes/conference.inc.php</b> on line <b>278</b><br />