Reports->sales->orders

Hi,

We are facing a big issue in reports 2.1.0.2 almost latest version if we have too many customers , orders and products. It shows Internal Server Error when we opens this link admin/index.php?route=report/sale_order ... same query used on dashboard also so sometime we are not able to login also. What i figured out there is some issue in admin/model/report/sale in following query
$sql = "SELECT MIN(o.date_added) AS date_start, MAX(o.date_added) AS date_end, COUNT(*) AS `orders`, SUM((SELECT SUM(op.quantity) FROM `" . DB_PREFIX . "order_product` op WHERE op.order_id = o.order_id GROUP BY op.order_id)) AS products, SUM((SELECT SUM(ot.value) FROM `" . DB_PREFIX . "order_total` ot WHERE ot.order_id = o.order_id AND ot.code = 'tax' GROUP BY ot.order_id)) AS tax, SUM(o.total) AS `total` FROM `" . DB_PREFIX . "order` o";
if i remove SUM of sum queries then it starts working. same issue was in older versions also forum.opencart.com/viewtopic.php?f=20&t=20611 . Kindly help me if someone know this issue.
Thanks in advance.

Hi webfes,

It would be a lot easier to tell people how you got the error in OpenCart not what URL causes the error.
I say this because you may have MODS / Extension / Themes causing the issue and someone would need to attempt to duplicate your error by using the standard way of getting to that location. In this way your error can be verified or disavowed due to your possible MODS causing the issue...