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select listing.*,listing.city as cname,country.name as ctname,state.name as sname,date_format(exp_date,'%m/%d/%Y') as edate from listing left join country on country.id = listing.country_id left join state on state.id = listing.state_id where listing.status=1 and (exp_date>=curdate() or ifnull(exp_date,'0000-00-00')='0000-00-00') and ( find_in_set(3,listing.cat_id)) order by listing.title asc limit -15, 15

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-15, 15' at line 1'