Plugin not working after 1000 replies?

After 1000 replies, or 50 pages of 20 replies, plugin redirect to 1st post instead of 1st unread.

anyway to correct it?

exemple here: http://www.cwowd.com/forum-communaute/topic/termine-conan-ks-livraison-en-retard-vague-1-prevue-mars-2016/

currently on page 49 and working fine. in 1-2 hours it won’t 😉

https://wordpress.org/plugins/bbpress-go-to-first-unread-post/