This happens to me fairly regularly as well.
Sounds like someone just used >= instead of > here.
Kind of tricky to explain.
When on a thread list/index page (like "all threads"), and you click on the time link of a thread ("1 minute ago", etc), and the last page of the actual posts contains 15 posts, it sends you to the next page, where there is nothing.
Let's say a thread has 15 posts, which seems to be what the pagination is set for. That's 1 page. If you click on the time link when on the thread index page, it will take you to a page 2, which doesn't exist. The page is blank (not totally blank, there just aren't any posts on it), with a "page 1" link to go back to.
If the thread has 16 posts, it goes to page 2, which has 1 post on it, which is correct. It only happens when the number of posts in a thread is evenly divisible by the pagination setting, and you click the time link to go to it.
I often click the time links so that I can just go to the last page of the thread, so this is kind of annoying to come to a blank page and have to click the previous pages link to get to the content.
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