duplicateOrder() function return nothing on adminOrders (adminCartControllers)

[Fred93Nord]

I upgraded prestashop from 1.5.? to 1.6.1

 

In admin order tab i used to copy cart from customer orders.

I tried this on 1.6 but nothing was displayed in products list when selecting an order.

sometime it work sometime it does not. it depend on order (last orders works)

 

In console log i can see this error :

 

TypeError: res is null

  id_cart = res.cart.id;    

 

i searched and found an ajax function named : duplicateOrder()

it look like it return something null...

 

it's something like:

...

success: function (res) {

id_cart = res.cart.id;

...

 

and res is null...

 

 

why ?

how to fix this ?

 

thanks