TTSSegmentsForwarder ERROR- agent stops speaking after this for 2-3 seconds. Facing this issue randomly.

[Test-isom]

{"message": "Task was destroyed but it is pending!\ntask: <Task pending name='Task-122' coro=<TTSSegmentsForwarder._main_task() running at /home/appuser/.local/lib/python3.12/site-packages/livekit/agents/utils/log.py:16> wait_for=<Future pending cb=[Task.task_wakeup()]>>", "level": "ERROR", "name": "asyncio", "pid": 166, "job_id": "AJ_yWi3pGCRRnqW", "timestamp": "2024-09-26T08:20:38.011601+00:00"}

[lhylton]

same issue here!

[nazywamsiepawel]

hey we're experiencing the same issue - which version are you using?

[davidzhao]

Could you share additional logs around this line? that'd be helpful to see the context that has led to this (feel free to blank out any transcriptions)

[nazywamsiepawel]

The only logs we got was this error above, over and over again. It seems that settings preemptive_synthesis=False stops this error from happening.

2024-09-27 09:34:13.034 PDT
Task was destroyed but it is pending! task: <Task pending name='Task-3420' coro=<TTSSegmentsForwarder._main_task.<locals>._forward_task() running at /home/appuser/.local/lib/python3.11/site-packages/livekit/agents/utils/log.py:16> wait_for=<Future pending cb=[Task.task_wakeup()]>>
2024-09-27 09:57:11.436 PDT
2024-09-27 16:57:11,437 - asyncio - ERROR - Task was destroyed but it is pending!
2024-09-27 09:57:11.437 PDT
2024-09-27 16:57:11,438 - asyncio - ERROR - Task was destroyed but it is pending!
2024-09-27 09:57:11.438 PDT
2024-09-27 16:57:11,437 - asyncio - ERROR - Task was destroyed but it is pending!
2024-09-27 09:57:11.438 PDT
Task was destroyed but it is pending! task: <Task pending name='Task-853' coro=<TTSSegmentsForwarder._main_task() running at /home/appuser/.local/lib/python3.11/site-packages/livekit/agents/utils/log.py:16> wait_for=<Future pending cb=[Task.task_wakeup()]>>
2024-09-27 09:57:11.438 PDT
2024-09-27 16:57:11,438 - asyncio - ERROR - Task was destroyed but it is pending!
2024-09-27 09:57:11.438 PDT
Task was destroyed but it is pending! task: <Task pending name='Task-855' coro=<TTSSegmentsForwarder._main_task.<locals>._forward_task() running at /home/appuser/.local/lib/python3.11/site-packages/livekit/agents/utils/log.py:16> wait_for=<Future pending cb=[Task.task_wakeup()]>>
2024-09-27 09:58:24.091 PDT
2024-09-27 16:58:24,092 - asyncio - ERROR - Task was destroyed but it is pending!
2024-09-27 09:58:24.091 PDT

[Test-isom]

Can you confirm preemptive_synthesis=False solves above issue, and will it impact anything in terms of performance or functionality?

[lhylton]

that fixed it for me and I did not notice a meaningful increase in latency or any other issues

[jezell]

same

[aryan1107]

Same issue

[SleepAt11]

Issue still exists.

[tbeaudouin05]

I have this issue with multimodal agent livekit-agents==0.12.15

[edengby]

Still having that issue: Task was destroyed but it is pending!

{"message": "Task was destroyed but it is pending!\ntask: <Task pending name='Task-135' coro=<_SegmentSynchronizerImpl._main_task() done, defined at /home/appuser/.local/lib/python3.11/site-packages/livekit/agents/utils/log.py:13> wait_for=<Future pending cb=[Task.task_wakeup()]> cb=[_SegmentSynchronizerImpl.__init__.<locals>.<lambda>() at /home/appuser/.local/lib/python3.11/site-packages/livekit/agents/voice/transcription/synchronizer.py:154]>", "level": "ERROR", "name": "asyncio", "room": "voice_assistant_room_7053", "user_id": "visitor_id", "pid": 25, "job_id": "AJ_GXpxYh5n25Ec", "timestamp": "2025-05-11T06:24:32.629090+00:00"}

versions:

livekit==1.0.6
livekit-agents==1.0.20
livekit-api==1.0.2
livekit-plugins-cartesia==1.0.20
livekit-plugins-noise-cancellation==0.2.1
livekit-plugins-deepgram==1.0.20
livekit-plugins-google==1.0.20
livekit-plugins-openai==1.0.20
livekit-plugins-silero==1.0.20
livekit-plugins-turn-detector==1.0.20
livekit-protocol==1.0.2

[davidzhao]

@edengby how could we reproduce this? could you share the agent configuration as well as what your agent is doing that could cause this?