StreamListener spammed with invalid events

[ASTRELION]

My project runs a subclass of StreamListener in a thread that listens for on_notification and on_conversation. It has been working fine for a couple years, but just recently I've been noticing spam for the following error (truncated to the relevant info):

  File "/home/astrelion/Projects/dungeons-bot/.venv/lib/python3.13/site-packages/mastodon/versions.py", line 50, in wrapper
    return function(self, *args, **kwargs)
  File "/home/astrelion/Projects/dungeons-bot/.venv/lib/python3.13/site-packages/mastodon/streaming_endpoints.py", line 20, in stream_user
    return self.__stream('/api/v1/streaming/user', listener, run_async=run_async, timeout=timeout, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
           ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/astrelion/Projects/dungeons-bot/.venv/lib/python3.13/site-packages/mastodon/internals.py", line 523, in __stream
    listener.handle_stream(r)
    ~~~~~~~~~~~~~~~~~~~~~~^^^
  File "/home/astrelion/Projects/dungeons-bot/.venv/lib/python3.13/site-packages/mastodon/streaming.py", line 148, in handle_stream
    self._dispatch(event)
    ~~~~~~~~~~~~~~^^^^^^^
  File "/home/astrelion/Projects/dungeons-bot/.venv/lib/python3.13/site-packages/mastodon/streaming.py", line 203, in _dispatch
    raise exception from err
mastodon.errors.MastodonMalformedEventError: ('Missing field', 'event', {})

This is the line where the error occurs: https://github.com/halcy/Mastodon.py/blob/master/mastodon/streaming.py#L189

I did a little bit of debugging and it seems that I'm getting periodic :thump events that can't be parsed by this event handler.

Is there something I'm doing wrong that causes getting those malformed events, or is it an issue with the library?

Mastodon.py version: tested on 2.1.4 and 1.8
Python: 3.13.11

[halcy]

That is in fact kind of weird. I do not think you are doing anything wrong, so it would probably be a library issue, or a "server is doing something kind of weird that I did not account for" issue. What would have to be happening for this is I think an empty line arriving without being preceded by a dispatchable event. Which I have no idea whether that is in spec or no, but I guess it can happen and could maybe be handled quietly. Which server is the bot on? do you think I could get an account there to investigate it myself?

On Thu, Jan 8, 2026, at 3:33 AM, ASTRELION wrote: My project runs a StreamListener in a thread that listens for `on_notification` and `on_conversation`. It has been working fine for a couple years, but just recently I've been noticing spam for the following error (truncated to the relevant info): ` File "/home/astrelion/Projects/dungeons-bot/.venv/lib/python3.13/site-packages/mastodon/versions.py", line 50, in wrapper return function(self, *args, **kwargs) File "/home/astrelion/Projects/dungeons-bot/.venv/lib/python3.13/site-packages/mastodon/streaming_endpoints.py", line 20, in stream_user return self.__stream('/api/v1/streaming/user', listener, run_async=run_async, timeout=timeout, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec) ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/astrelion/Projects/dungeons-bot/.venv/lib/python3.13/site-packages/mastodon/internals.py", line 523, in __stream listener.handle_stream(r) ~~~~~~~~~~~~~~~~~~~~~~^^^ File "/home/astrelion/Projects/dungeons-bot/.venv/lib/python3.13/site-packages/mastodon/streaming.py", line 148, in handle_stream self._dispatch(event) ~~~~~~~~~~~~~~^^^^^^^ File "/home/astrelion/Projects/dungeons-bot/.venv/lib/python3.13/site-packages/mastodon/streaming.py", line 203, in _dispatch raise exception from err mastodon.errors.MastodonMalformedEventError: ('Missing field', 'event', {})

`

…

This is the line where the error occurs: https://github.com/halcy/Mastodon.py/blob/master/mastodon/streaming.py#L189 I did a little bit of debugging and it seems that I'm getting periodic :thump events <https://docs.joinmastodon.org/methods/streaming/#http> that can't be parsed by this event handler. Is there something I'm doing wrong that causes getting those malformed events, or is it an issue with the library? Mastodon.py version: tested on 2.1.4 and 1.8 Python: 3.13.11 — Reply to this email directly, view it on GitHub <#434> or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAOR4JDOO42RLRZOM2KQEL4FWXVHBFKMF2HI4TJMJ2XIZLTSSBKK5TBNR2WLJDUOJ2WLJDOMFWWLO3UNBZGKYLEL5YGC4TUNFRWS4DBNZ2F6YLDORUXM2LUPGBKK5TBNR2WLJLJONZXKZNENZQW2ZNLORUHEZLBMRPXI6LQMWBKK5TBNR2WLKBSGAYTCOBXHAZKI3TBNVS2QYLDORXXEX3JMSBKK5TBNR2WLJDUOJ2WLJDOMFWWLLTXMF2GG2C7MFRXI2LWNF2HTLDTOVRGUZLDORPXI6LQMWSUS43TOVS2M5DPOBUWG44SQKSHI6LQMWVHEZLQN5ZWS5DPOJ42K5TBNR2WLKBXGQ3DCOBYGAYYFJDUPFYGLJLJONZXKZNFOZQWY5LFVIZTOOJQHEYDGNJRHGTXI4TJM5TWK4VGMNZGKYLUMU>. You are receiving this email because you are subscribed to this thread. Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[ASTRELION]

It's just on mastodon.social (https://mastodon.social/@dungeons and https://mastodon.social/@dungeonsbeta)

[halcy]

Thanks. I want to take a look at it, but I think it will be at minimum a month until I find the capacity to do any work on this project. Sorry for the delay.