**Steps to replicate the issue** (include links if applicable):
* Go to any old revision for any page that is in the main namespace or the namespaces Talk, User, User talk, Wikipedia, Wikipedia talk, MediaWiki, MediaWiki talk, Help, Help talk, Category, Portal, & Portal talk on the English Wikipedia. (e.g. https://en.wikipedia.org/w/index.php?title=Strategic_Imperial_Conquest&oldid=1223384936)
* Click on the print PDF button
**What happens?**:
The page links to an error page of Special:Book.
{F62348948}
**What should have happened instead?**:
It should have to a print page that allows you to print that specific revision as a PDF file. The alternative is to simply have that button not exist when viewing old revisions, similar to other wikis. It’s very interesting that this only appears to be a problem on Wikipedia specifically.
**Software version** (on `Special:Version` page; skip for WMF-hosted wikis like Wikipedia):
**Other information** (browser name/version, screenshots, etc.):
I somehow managed to access the book creator through this method, though I can’t seem to replicate that.