Edit orderdetails in backend freezes

Could you turn on the "error reporting" and "debug mode" options of your joomla configuration and try again ?

Do you get any error ?

I don't see anything in that file.
Please do a screenshot.

For some reason is seems that you have a custom field with the column name "product" but that this column does not exist in the database.

You will have to create it manually by running the query below via PHPMyAdmin:
ALTER TABLE mpw_hikashop_order ADD `product` TEXT NOT NULL DEFAULT '';

OR delete that custom field and create a new one (which should create the column in the database.

Hi,

Please turn on again the "error reporting" and "debug mode" options of your joomla configuration and try again. Let us know what happens.

Hi,

Could you try to change the code:
$element->product = $fieldsClass->getInput('item',$old,false);

to:
$fieldsClass->getInput('item',$old,false);
$element->product = $_SESSION;

in the file administrator/components/com_hikashop/controllers/order.php and try again ?