Suddenly we are getting the following error in our public website in production:

500: Internal Server Error 

'product.wishlist'
Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\base\ir\ir_qweb\qweb.py", line 341, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "", line 1, in template_website_layout_321
  File "", line 2, in body_call_content_320
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\api.py", line 760, in __getitem__
    return self.registry[model_name]._browse((), self)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\modules\registry.py", line 181, in __getitem__
    return self.models[model_name]
KeyError: 'product.wishlist'

Error to render compiling AST
KeyError: 'product.wishlist'
Template: website.layout
Path: /templates/t/t/div/header/div/div/div[2]/ul/t[3]/t
Node: