PrestaShop Error 500 PREG_BACKTRACK_LIMIT_ERROR

I've got a problem with PrestaShop's site. After I add product to comparison and following a link to the page it shows 500 server error. In server logs:

ERROR: PREG_BACKTRACK_LIMIT_ERROR in function packJSinHTML, referer: https://svdd.ru/products-comparison

Almost a month I can't understand what's wrong. Thank you in advance for any answer!