This is a recent regression. A fix has been merged for 5.33 (RC) and the upcoming 5.32.2.


I eventually found the error for this problem, which was triggering an error for CiviEvent registrations and event reminders. Guidance from @Demerit and @petednz should have led me to it sooner. The problem was caused by an email address with a 9-letter top level domain, and regex in sparkpost.php which assumes that top level domains are between 2 and 4 ...


Are you using price sets for the ones that are public and chargeable? If so, we add an option and set the visibility to Admin. Then we can add them in the back-end, but they don't show up publicly.

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