problem may have something to do with how many posts on a page you have set in your preferences. If someone has… say 10 posts per page set and then they're on page 8 and send you a link to a post that's on page 8 for them… and you have it set to 20 posts per page (which would be page 4 for you) and there aren't actually 8 pages of posts at your 20per setting… you'd get an error.
There's a few other oddities going on, but that's what it sounds like a problem may be in this case.
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