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important, post your prestashop version and php version in all posts, please add here.
This is Prestashop Checkout (ps_checkout) front-office SDK throwing JS errors on every page because it expects an element called:
#ps_checkout-loader
…but your theme does not contain that element.
When that JS crashes, it stops all subsequent JS execution, which breaks:
- product attribute selection
- add-to-cart refresh
- URL updates
- any AJAX product action
Quick instructions for accessing Developer Tools
How to enable PrestaShop debug mode and perform basic analysis