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Hi,
I've an eShop with Prestashop 1.7.6.1 and everything worked properly.

This morning I upgraded these modules:
- ps_shoppingcart
- ps_contactinfo
- blockreassurance
- ps_themecusto
- ps_linklist
- ps_emailsubscription
- ps_facetedsearch

After this operation I receive this smarty error when a product is added to the cart:

(1/1) ContextErrorException
Notice: Undefined index: product

in 35655e6409b6198f29dd6e732ef9598dec599880_2.module.psshoppingcartpsshoppingc.php line 58
at content_5dde394def7fc5_19831675(object(SmartyDevTemplate))
in smarty_template_resource_base.php line 123
at Smarty_Template_Resource_Base->getRenderedTemplateCode(object(SmartyDevTemplate))
in smarty_template_compiled.php line 114
at Smarty_Template_Compiled->render(object(SmartyDevTemplate))
in smarty_internal_template.php line 216
at Smarty_Internal_Template->render(false, 0)
in smarty_internal_templatebase.php line 232
at Smarty_Internal_TemplateBase->_execute(null, null, null, null, 0)
in smarty_internal_templatebase.php line 116
at Smarty_Internal_TemplateBase->fetch(null, null, null, null, false, true, false)
in SmartyDevTemplate.php line 40
at SmartyDevTemplateCore->fetch()
in Module.php line 2447
at ModuleCore->fetch('module:ps_shoppingcart/ps_shoppingcart.tpl')
in ps_shoppingcart.php line 98
at Ps_Shoppingcart->renderWidget('displayTop', array('smarty' => object(SmartyDevTemplate), 'cookie' => object(Cookie), 'cart' => object(Cart)))
in Hook.php line 975
at HookCore::coreRenderWidget(object(Ps_Shoppingcart), 'displayTop', array('smarty' => object(SmartyDevTemplate), 'cookie' => object(Cookie), 'cart' => object(Cart)))
in Hook.php line 927
at HookCore::exec('displayTop', array('smarty' => object(SmartyDevTemplate)), null)
in smarty.config.inc.php line 167
at smartyHook(array('h' => 'displayTop'), object(SmartyDevTemplate))
at call_user_func_array('smartyHook', array(array('h' => 'displayTop'), object(SmartyDevTemplate)))
in SmartyLazyRegister.php line 83
at SmartyLazyRegister->__call('smartyHook', array(array('h' => 'displayTop'), object(SmartyDevTemplate)))
at SmartyLazyRegister->smartyHook(array('h' => 'displayTop'), object(SmartyDevTemplate))
at call_user_func_array(array(object(SmartyLazyRegister), 'smartyHook'), array(array('h' => 'displayTop'), object(SmartyDevTemplate)))
in 098840d2c0bfc9ec72766e0ff7043a16c89b268d_2.file.header.tpl.php line 143
at Block_288152925dde39579a7d96_40263247->callBlock(object(SmartyDevTemplate))
in smarty_internal_runtime_inheritance.php line 248
at Smarty_Internal_Runtime_Inheritance->callBlock(object(Block_288152925dde39579a7d96_40263247), object(SmartyDevTemplate))
in smarty_internal_runtime_inheritance.php line 184
at Smarty_Internal_Runtime_Inheritance->process(object(SmartyDevTemplate), object(Block_288152925dde39579a7d96_40263247))
in smarty_internal_runtime_inheritance.php line 156
at Smarty_Internal_Runtime_Inheritance->instanceBlock(object(SmartyDevTemplate), 'Block_288152925dde39579a7d96_40263247', 'header_top')
in 098840d2c0bfc9ec72766e0ff7043a16c89b268d_2.file.header.tpl.php line 34
at content_5dde39579adb35_67959320(object(SmartyDevTemplate))
in smarty_template_resource_base.php line 123
at Smarty_Template_Resource_Base->getRenderedTemplateCode(object(SmartyDevTemplate))
in smarty_template_compiled.php line 114
at Smarty_Template_Compiled->render(object(SmartyDevTemplate))
in smarty_internal_template.php line 216
at Smarty_Internal_Template->render()
in smarty_internal_template.php line 385
at Smarty_Internal_Template->_subTemplateRender('file:_partials/header.tpl', null, 'layouts/layout-full-width.tpl', 0, 3600, array(), 0, false)
in e0f63929e52ae89f130cc59ae95cbc6445d5959b_2.file.layout-both-columns.tpl.php line 191
at Block_12245318575dde39578f7777_87842516->callBlock(object(SmartyDevTemplate))
in smarty_internal_runtime_inheritance.php line 248
at Smarty_Internal_Runtime_Inheritance->callBlock(object(Block_12245318575dde39578f7777_87842516), object(SmartyDevTemplate))
in smarty_internal_runtime_inheritance.php line 184
at Smarty_Internal_Runtime_Inheritance->process(object(SmartyDevTemplate), object(Block_12245318575dde39578f7777_87842516))
in smarty_internal_runtime_inheritance.php line 156
at Smarty_Internal_Runtime_Inheritance->instanceBlock(object(SmartyDevTemplate), 'Block_12245318575dde39578f7777_87842516', 'header')
in e0f63929e52ae89f130cc59ae95cbc6445d5959b_2.file.layout-both-columns.tpl.php line 58
at content_5dde3957927014_32388767(object(SmartyDevTemplate))
in smarty_template_resource_base.php line 123
at Smarty_Template_Resource_Base->getRenderedTemplateCode(object(SmartyDevTemplate))
in smarty_template_compiled.php line 114
at Smarty_Template_Compiled->render(object(SmartyDevTemplate))
in smarty_internal_template.php line 216
at Smarty_Internal_Template->render()
in smarty_internal_template.php line 385
at Smarty_Internal_Template->_subTemplateRender('layouts/layout-both-columns.tpl', null, 'layouts/layout-full-width.tpl', 0, 3600, array(), 2, false, null, null)
in smarty_internal_runtime_inheritance.php line 126
at Smarty_Internal_Runtime_Inheritance->endChild(object(SmartyDevTemplate), 'layouts/layout-both-columns.tpl')
in d47c8a87a0eb32efe67bb16dc76fe5dc9b8964a3_2.file.layout-full-width.tpl.php line 42
at content_5dde39578dad49_20820842(object(SmartyDevTemplate))
in smarty_template_resource_base.php line 123
at Smarty_Template_Resource_Base->getRenderedTemplateCode(object(SmartyDevTemplate))
in smarty_template_compiled.php line 114
at Smarty_Template_Compiled->render(object(SmartyDevTemplate))
in smarty_internal_template.php line 216
at Smarty_Internal_Template->render()
in smarty_internal_template.php line 385
at Smarty_Internal_Template->_subTemplateRender('layouts/layout-full-width.tpl', null, 'layouts/layout-full-width.tpl', 0, 3600, array(), 2, false, null, null)
in smarty_internal_runtime_inheritance.php line 126
at Smarty_Internal_Runtime_Inheritance->endChild(object(SmartyDevTemplate), 'layouts/layout-full-width.tpl')
in 4e23d550fb5ebbd0042fbf89026de683e8bef4ea_2.file.cart.tpl.php line 36
at content_5dde3dd7456ee5_56505829(object(SmartyDevTemplate))
in smarty_template_resource_base.php line 123
at Smarty_Template_Resource_Base->getRenderedTemplateCode(object(SmartyDevTemplate))
in smarty_template_compiled.php line 114
at Smarty_Template_Compiled->render(object(SmartyDevTemplate))
in smarty_internal_template.php line 216
at Smarty_Internal_Template->render(false, 0)
in smarty_internal_templatebase.php line 232
at Smarty_Internal_TemplateBase->_execute('checkout/cart.tpl', null, 'layouts/layout-full-width.tpl', null, 0)
in smarty_internal_templatebase.php line 116
at Smarty_Internal_TemplateBase->fetch('checkout/cart.tpl', null, 'layouts/layout-full-width.tpl', null, false, true, false)
in SmartyDev.php line 40
at SmartyDev->fetch('checkout/cart.tpl', null, 'layouts/layout-full-width.tpl')
in FrontController.php line 683
at FrontControllerCore->smartyOutputContent('checkout/cart.tpl')
in FrontController.php line 667
at FrontControllerCore->display()
in Controller.php line 312
at ControllerCore->run()
in Dispatcher.php line 515
at DispatcherCore->dispatch()
in index.php line 28

What can I do to solve this situation?

If i clear the cache of the browser the website start to work properly another time, but it still impossible to open the cart or complete an order.

Thanks