nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6 also reported an undefined error, but in his case it happened when reporting a post. Looks like it might be the same root cause—under certain conditions Jumble hits an undefined error when publishing an event.
Discussion
incidentally the instant show of new posts by the user doesn't happen anymore either