Self-hosted exception: 1st argument: not an iodata term erlang.iolist_to_binary...

[eracle]

I copy paste here so it can be useful for self-hosted instances:
plausible/analytics#1570

[eracle]

In other words, when sending props to a self-hosted instance during a custom event, the server returns a 500 error.
I solved using JSON dumps:

import json
props = json.dumps(props)
ok = send_custom_event(request, name="Event", props=props)