TextAudioSynchronizer error in JS voice agent pipeline

[allanjsx]

Describe the bug

Encountered random crash very often of TextAudioSynchronizer is closed

Relevant log output

waiting for participant
starting assistant example agent for connected-protocol
executing weather function for Singapore
file:///Users/swarm-container-caumyw2/node_modules/.pnpm/@livekit+agents@0.7.0_@livekit+rtc-node@0.13.3/node_modules/@livekit/agents/dist/transcription.js:215
      throw new Error("TextAudioSynchronizer is closed");
            ^

Error: TextAudioSynchronizer is closed
    at #checkNotClosed (file:///Users/swarm-container-caumyw2/node_modules/.pnpm/@livekit+agents@0.7.0_@livekit+rtc-node@0.13.3/node_modules/@livekit/agents/dist/transcription.js:215:13)
    at TextAudioSynchronizer.markTextSegmentEnd (file:///Users/swarm-container-caumyw2/node_modules/.pnpm/@livekit+agents@0.7.0_@livekit+rtc-node@0.13.3/node_modules/@livekit/agents/dist/transcription.js:72:25)
    at file:///Users/swarm-container-caumyw2/node_modules/.pnpm/@livekit+agents@0.7.0_@livekit+rtc-node@0.13.3/node_modules/@livekit/agents/dist/pipeline/agent_output.js:156:25
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

Node.js v20.19.2
libc++abi: terminating due to uncaught exception of type std::__1::system_error: mutex lock failed: Invalid argument
[20:04:39.145] WARN (82128): job process exited unexpectedly; this likely means the error above caused a crash
    err: {
      "type": "Error",
      "message": "Channel closed",
      "stack":
          Error [ERR_IPC_CHANNEL_CLOSED]: Channel closed
              at target.send (node:internal/child_process:753:16)
              at Timeout._onTimeout (file:///Users/swarm-container-caumyw2/node_modules/.pnpm/@livekit+agents@0.7.0_@livekit+rtc-node@0.13.3/node_modules/@livekit/agents/dist/ipc/supervised_proc.js:46:17)
              at listOnTimeout (node:internal/timers:581:17)
              at process.processTimers (node:internal/timers:519:7)
      "code": "ERR_IPC_CHANNEL_CLOSED"
    }

Describe your environment

System:
    OS: macOS 15.1.1
    CPU: (8) arm64 Apple M1 Pro
    Memory: 201.84 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.19.2 - ~/.nvm/versions/node/v20.19.2/bin/node
    Yarn: 1.22.22 - ~/.nvm/versions/node/v18.18.2/bin/yarn
    npm: 10.8.2 - ~/.nvm/versions/node/v20.19.2/bin/npm
    pnpm: 8.6.12 - ~/.nvm/versions/node/v18.18.2/bin/pnpm
  npmPackages:
    @livekit/agents: ^0.7.0 => 0.7.0 
    @livekit/agents-plugin-deepgram: ^0.5.3 => 0.5.3 
    @livekit/agents-plugin-elevenlabs: ^0.6.1 => 0.6.1 
    @livekit/agents-plugin-openai: ^0.9.0 => 0.9.0 
    @livekit/agents-plugin-silero: ^0.5.3 => 0.5.3 
    @livekit/rtc-node: ^0.13.3 => 0.13.3 

Minimal reproducible example

Reproduce step:

1. Create a sandbox
2. Set up the local environment for the sandbox with Node agent pipleline mode
3. Talk to the sandbox agent, after a few message it will report this error.

Reproduce video: Screen recording (error after the 3rd voice interaction)

Additional information

No response

[Z-Gort]

+1