FO - Shopping cart page - an exception is displayed when the module ps_crossseliing is transplanted to the hook displayCrossSellingShoppingCart

[khouloudbelguith]

Prerequisites

• I understand and accept the project's code of conduct
• I have already searched in existing issues and found no previous report of this bug.

Describe the bug and add screenshots

In the FO - Shopping cart page - an exception is displayed when the module ps_crossseliing is transplanted to the hook displayCrossSellingShoppingCart

Expected behavior

No response

Steps to reproduce

1. Install the module ps_crossselling
2. Go to BO > Design > Position page
3. Transplant the module ps_crossselling to the hook displayCrossSellingShoppingCart
4. Go to FO > Add a product to the cart > Go to shopping cart page
5. Remove the product
6. Refresh the page => see exception
   

Also

1. Go to FO > Sign in
2. Add a product to the cart > Go to shopping cart page
3. Sign out
4. See exception

PrestaShop version(s) where the bug happened

1.7.6.9, develop

PHP version(s) where the bug happened

7.1, 7.2

If your bug is related to a module, specify its name and its version

No response