I was trying to create a synonym on Arts & Crafts. Clicking the 'Create Synonym' button threw this error:

screenshot of error, showing the Tag Synonyms page, with the code of another page titled "Oops! Something Bad Happened" showing as an overlay

It seems the 'Create tag synonym' pop-up got replaced by the code of the (error) page I would normally (?) be redirected to:

<!DOCTYPE html> <html class="html__responsive " lang="en"> <title>Oops! Something Bad Happened - Arts & Crafts Stack Exchange</title> [&c...]

It doesn't seem to matter on which tab of the synonyms page I click on the 'Create synonym' button.

Note that the tag I wanted to create a synonym for did not yet exist (I anticipate its use).
The way the error was thrown was not caused by Dark Reader (visible in the screenshot — I mention it because it's the only plugin I have that changes the visual layout of pages in Firefox).

  • Firefox v. 101.0.1
  • Windows 10 Pro 19044.1706
  • 4
    Writing clear error messages is an art in itself ...
    – Glorfindel Mod
    Jun 13, 2022 at 14:29
  • 3
    @Glorfindel I wouldn't mind taking a crack at that particular art, but I fear Arts & Crafts is not the right site to hone that skill :)
    – Joachim
    Jun 13, 2022 at 14:32
  • 1
    I'm guessing you're referring to what happens when you click the "Create synonyms" button on the /tags/synonyms page itself (rather than the corresponding button in the modal dialog box that appears)?
    – V2Blast
    Jun 13, 2022 at 16:35
  • 2
    After testing it myself (with an existing destination tag, but a source tag that didn't already exist as a tag), it looks like the initial "Create synonym" button works correctly to bring up the modal – but filling in the fields and then clicking the "Create synonym" button in the modal itself throws the error shown in your screenshot. In addition, initially suggesting a synonym from the /tags/<tagname>/synonyms page throws a different-looking but also problematic error (that seems to include an embedded version of the page with a red background).
    – V2Blast
    Jun 13, 2022 at 19:55
  • 4
    @V2Blast the synonym creation code changed recently perhaps that's the cause. Jun 13, 2022 at 20:11

1 Answer 1


This has been fixed.

regression error
from the aforementioned fix
sorry about that

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