Need Help in Htaccess

I can do coding very well but not much ideas with htaccess.

One of my client's website is created by other company but there is some issue as below.

https://www.amerrugs.com/about-amer
This url is working fine. But when adding slash / at last of URL like
https://www.amerrugs.com/about-amer/ then its giving internal error. While its working fine with product category means when we are opening category then its redirecting and adding slash (/) automatically...

Need Help in Htaccess

from Apache https://ift.tt/2HZbyTZ
via IFTTT