Blank page on edit Display > View > Product > Cart

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.2
-- PHP version -- : 5.6.26
-- Browser(s) name and version -- : Chrome 53.0.2785.143 (64-bit)

Hi,
I have a problem about Display section.

When I select Display > View and I edit any page all works well.
But if I want to customize the page "CART" (on any template) there's a weird issue.
After editing and clicking save button the page turns blank. The cart in frontend consequently disappears.
If I delete customization everything returns to work properly.
Don't know why. But I need to customize this page.

Thank you

Hi,

It's probably a problem with a security module of your web server which flags the post of that request because of the PHP code in the cart view file is found potentially harmful (it's a false positive).
An easy alternative is to edit the view file via the template manager of Joomla:
docs.joomla.org/J3.x:How_to_use_the_Template_Manager
Otherwise, you can check with your hosting company to see if they can do something with the configuration of their security module.