What could have broken the checkout cart in Opencart 2.3?

Question

opencart

Order processing worked fine, orders were processed. Suddenly, on the checkout page, instead of the final table with the final price, a bunch of notice appeared:
Notice: Undefined variable: header in /var/www/u1522396/data/www/site.ru/catalog/view/theme/default/template/checkout/simplecheckout_cart. tpl on line 1
It turns out that these variables are not passed to the simplecheckout_cart.tpl display
Why could this happen?

Answer 1

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