Something quite weird is going on, because there will never be a quiz with id 0. In Moodle, ids always start a 1 and go up from there.
This suggests that somewhere, the id is going missing, and then that missing value is being treated as 0, and then naturally when it looks for quiz 0, it does not exist.
To make progress, we really need to pin down the circumstances that trigger this bug.
Unable to submit a quiz for some users - gives the "There is no quiz with id 0" error
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