callOnEachEvent() swallows errors

[chmac]

I run callOnEachEvent() to keep a long lived connection to our server to feed data into a bot. I see this in our logs:

zulip-js: Error while communicating with server: SyntaxError: Unexpected end of JSON input

But the function did not throw, so the loop never restarts. Reading the code of src/events_wrapper.js it seems like errors are caught and passed to logError(). But there's no logic in there, at least not that I can see, to recover from said errors. Is this handled somehow and I'm missing it?