Open
Description
Before creating a ticket, please consider if this should fit the discussion forum better.
Environment
- ejabberd version: 25.04
- Erlang version:
Erlang (SMP,ASYNC_THREADS) (BEAM) emulator version 15.2.6 - OS: Linux (Debian)
- Installed from: official deb/rpm
Configuration (only if needed): grep -Ev '^$|^\s*#' ejabberd.yml
loglevel: 4Not sure this relates to any part of the config
Errors from error.log/crash.log
No errors
Bug description
Please, give us a precise description (what does not work, what is expected, etc.)
ejabberd occasionally sends empty messages:
{
"content": {
"body": "",
"msgtype": "m.text",
"net.process-one.xmpp-id": "02b22094-24b5-4f36-a9e7-a3e5ba8a4431"
},
"event_id": "$Ev9YPSJ4HVnj08uhJs5RN3PsF3PV4-BLmljY-IAEK50",
"origin_server_ts": 1747674408209,
"sender": "@erebion:ejabberd.erebion.eu",
"type": "m.room.message",
"unsigned": {
"membership": "join"
}
}
(Note that the body does not contain an actual message.)
Matrix bridges, such as Mautrix Discord, then respond with a message complaining about an error:
⚠ Your message was not bridged: 50006: Cannot send an empty message
The logs of such a bridge contain the following:
2025-05-19T17:06:48Z DBG Sent message checkpoint message_checkpoint={"event_id":"$Ev9YPSJ4HVnj08uhJs5RN3PsF3PV4-BLmljY-IAEK50","event_type":"m.room.message","message_type":"m.text","reported_by":"BRIDGE","retry_num":0,"room_id":"!avHtPbJBFIkqXODJcI:matrix.un-hack-bar.de","status":"SUCCESS","step":"BRIDGE","timestamp":1747674408484}
2025-05-19T17:06:48Z ERR Matrix event not handled error="HTTP 400 Bad Request, {\"message\": \"Cannot send an empty message\", \"code\": 50006}" action="send matrix message metrics" channel_id=637233944919539712 channel_receiver= event_id=$Ev9YPSJ4HVnj08uhJs5RN3PsF3PV4-BLmljY-IAEK50 event_type=m.room.message result="Error sending event" room_id=!avHtPbJBFIkqXODJcI:matrix.un-hack-bar.de sender=@erebion:ejabberd.erebion.eu
2025-05-19T17:06:48Z DBG Sent message checkpoint message_checkpoint={"event_id":"$Ev9YPSJ4HVnj08uhJs5RN3PsF3PV4-BLmljY-IAEK50","event_type":"m.room.message","info":"HTTP 400: 50006: Cannot send an empty message","message_type":"m.text","reported_by":"BRIDGE","retry_num":0,"room_id":"!avHtPbJBFIkqXODJcI:matrix.un-hack-bar.de","status":"PERM_FAILURE","step":"REMOTE","timestamp":1747674408637}
Now, the questions are:
- Does the Matrix spec allow empty messages?
- Is that a bug with the bridge or is it correct in posting the error?
- Should I open an issue on the bridge's bug tracker?
edit: fixed formatting