The SEF URL with characters 0, /

Server ubuntu 16, vestacp, version of opencart 2.3.0.2
After the inclusion on SEF URL goods that start from scratch or in them there is a sign / when entering the product page gives a Bad Request
Your browser can not understand.
Or error 400 or blank page, tried different recipes for the treatment did not work, after turning off the SEF URL everything works fine, tell me how to treat.

Simple, use only numbers, letters, dashes and underscores in SEO URLs