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I recently upvoted a comment (first time upvoting that specific comment) on my meta site and received an error message stating "You cannot mark a comment more than once." Another mod mentioned they encountered the same thing occurring on their site.

After a bit of testing, it seems to only affect moderators when they are voting on a site they moderate.

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Possibly related to this bug or its fix.

As mentioned by @Makyen,

The bug is that two POST requests are sent when the comment upvote button is clicked. Depending on the time between them and the exact servers which they hit, I'd expect to intermittently see an error.

I have also confirmed myself that 2 POST requests are sent when I upvote a comment. The first succeeds, while the second fails with the above error message.

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    I think it's possible this is only happening on sites that we moderate. If you think this comment is useful you may even be able to test that here.
    – Bryan Krause
    Commented Jun 26 at 20:03
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    @BryanKrause seems likely as i can upvote your comment without the bug occurring.
    – Dragonrage
    Commented Jun 26 at 20:04
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    Reproduced here - upvoted Bryan's comment, that succeeded, but I got the same message as you did. With my sockpuppet account, it doesn't happen, so Bryan's observation is spot on.
    – Glorfindel Mod
    Commented Jun 26 at 20:06
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    Definitely a bug. Definitely only seen on the site where I'm a moderator. The bug is that two POST requests are sent when the comment upvote button is clicked. Depending on the time between them and the exact servers which they hit, I'd expect to intermittently see an error (e.g., I, twice, saw both POST requests succeed, but would expect failure if the requests were further apart in time or happened to hit the same server).
    – Makyen
    Commented Jun 26 at 20:14
  • Consequently, you are unable to unupvote a comment you’ve upvoted.
    – Thomas Markov
    Commented Jun 26 at 20:32
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    Related, and likely the same root cause: Moderators trying to delete or undelete comments are now prompted to confirm (and canceling does not work)
    – Ryan M
    Commented Jun 26 at 22:22

1 Answer 1

Reset to default
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Two bugfixes went out just a bit ago -- one for this problem, and one for the related issue re: mod deletes and undeletes.

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  • Can confirm that I am able to upvote comments on the site I moderate without the error popup, and I'm only seeing one POST now. Thanks!
    – Dragonrage
    Commented Jun 27 at 18:09

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