Hi,
Try to change the code:
$copy_query=str_replace('WHERE','LEFT JOIN '.hikashop_table('price').' AS pprice ON '.$product_table.'.product_id=pprice.price_product_id WHERE',$copy_query);
to:
$replace = 'LEFT JOIN '.hikashop_table('price').' AS pprice ON '.$product_table.'.product_id=pprice.price_product_id WHERE';
$conditions = array();
hikashop_addACLFilters($conditions, 'price_access', 'pprice');
if(count($conditions))
$replace .= ' '.$conditions[0].' AND';
$copy_query=str_replace('WHERE',$replace,$copy_query);
in the file administrator/components/com_hikashop/classes/filter.php
That should hopefully fix the issue.