500 error at old URL for numeric tag (Google crawl fail)

Ed_S
Thu, 02 Apr 2026 11:08:05 +0000
UX

My forum has a tag which happens to be a 4 digit number, 6309. It’s been around for a while. It displays OK on posts, and the URL in that case is /tag/210-tag/210

But rather than a pretty 404 page, a url like /tag/6309 is returning a server error:

Oops

The software powering this discussion forum encountered an unexpected problem. We apologize for the inconvenience.

I’m guessing that some time previously that was a valid way to refer to the tag. Because it’s a server error, google’s crawler is complaining to me about it.

Tag page looks like this:

I think 404 would be correct.

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