Page not found (404)

Request Method: GET
Request URL: https://opt-stroy.com/product/klapan-balansirovochnyi-3-4-vt-054-n00000016362/
Raised by: apps.catalog.views.product_detail

No Product matches the given query.

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.