Error when trying to amend existing vote on comment

Hi,

If you vote up on a comment and then try to vote down (or vice versa), it fails due to an ‘Unknown error’ (or a database error if you are using SQLite).

This can been on the demo site at https://demo.comentario.app/.

Here’s a screen recording of the problem:

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I’d expect it to just change the vote, rather than display an error.

Thanks