I migrated my project sylius from a server (A) ubuntu 14.04 php 7.1.27 to a server (B) Ubuntu 18.04 php 7.1.33. Since this migration I can not update my cart following the modification of the quantity of a product for example. The action of my form is: sylius_shop_cart_save. When I submit the update form the processing of the request takes a lot of time and returns a 500 error. Knowing that it still works well on the old server. Can someone help me?