3.20 - problem with searching in admin panel?

Hi guys!
few days ago i upgrade NOP from 3.0 > 3.20 and now i have problem with searching in admin panel example: "bulk edit products".

When I type product name and click search - then nothing happen... and pagination is stop working (when i click page 2, 3 etc. nothing happen... when click ctrl + F5 > pagination works fine).

Any idea why thats works wrong?

I testing on IE 11 and Chrome.

My page http://www.godstoys.pl - on customer page searching works fine.

I suspect the AJAX is returning an error.  You'll need to debug this in the browser's developer tools. (I did it a few months ago in Chrome, so I forget exactly which tab,etc. I used)

My teammate help me. That was something wrong with SKU in database. Now it's fixed.