Finally I knew the problem
When I am using the main and the sub category in Arabic and the post url in Arabic the page go blank (not sure why)
I changed my categories url to English and now everything working fine.
So here is the url I was testing
https://www.massi7e.org/christian-theology/???????-????-???????/?????-????-???????
now I had christian-theology url ???????-???????
And was not working
this subcategory also was not working
https://www.massi7e.org/topics/christian-theology/???????-????-???????
After changing it to English all working.
Thanks all for your help and I hope this will help others.