FROM acc_trans acc
INNER JOIN chart c ON (acc.chart_id = c.id AND c.link LIKE '%AR_paid%')
WHERE 1=1 $inwhere AND acc.trans_id = ac.trans_id)
- / (SELECT amount FROM ar WHERE id = ac.trans_id)
+ / COALESCE((SELECT amount FROM ar WHERE id = ac.trans_id and amount != 0 ), 1)
) AS amount, c.pos_eur
FROM acc_trans ac
LEFT JOIN chart c ON (c.id = ac.chart_id)