I just realize that there is already that problem and it was resolved (by wrong search). So, when i did the update, I updated nginx too. So here the post :
So it solved.
[Solved] "There are no unread topics" appears even though there are unread topics
The "no unread" message should look like this in your
unread.tpl, if you've overridden the default template (from vanilla) in your theme:
<div id="category-no-topics" class="alert alert-warning <!-- IF topics.length -->hidden<!-- ENDIF topics.length -->"> <strong>[[unread:no_unread_topics]]</strong> </div>
If you haven't overridden it, then update vanilla