Search form not working on posts pages

Hello guys,

You created a great theme, I really love it but today found one big problem in it. The search form doesn’t work when you use it on post pages (it works well while using on main page), it either doesn’t search at all and shows the same page, or shows message “Sorry, no posts matched your criteria” though the posts with the keywords I use exist. The same problem I found on your demo version:
https://demo.krusze.com/krusze/template-sticky/?s=hello

Hope you’ll find out the source of this problem and update the theme. Don’t want to look for another theme only because of search form.