[Bug]: AttributeError in cartesia_synthesizer.py tear_down

[spalman]

Brief Description

I'm conducting calls using Cartesia.AI TTS and Sentry reported AttributeError 'NoneType' object has no attribute 'close' in 118/600 cases. I couldn't reproduce it, but checking that websocket is not None might help.

Stack trace:

• vocode/streaming/synthesizer/cartesia_synthesizer.py in tear_down at line 209

  204
          await super().tear_down()
  205
          if self.no_more_inputs_task:
  206
              self.no_more_inputs_task.cancel()
  207
          if self.ctx:
  208
              self.ctx._close()
  209
          await self.ws.close()
  210
          await self.client.close()

  __class__ | -- | -- self |
• vocode/streaming/streaming_conversation.py in terminate at line 1014

  1009
          if self.events_manager and self.events_task:
  1010
              logger.debug("Terminating events Task")
  1011
              self.events_task.cancel()
  1012
              await self.events_manager.flush()
  1013
          logger.debug("Tearing down synthesizer")
  1014
          await self.synthesizer.tear_down()
  1015
          logger.debug("Terminating agent")
  1016
          await self.agent.terminate()
  1017
          logger.debug("Terminating output device")
  1018
          await self.output_device.terminate()
  1019
          logger.debug("Terminating speech transcriber")

LLM

GPT-4

Transcription Services

Deepgram

Synthesis Services

None

Telephony Services

Twilio

Conversation Type and Platform

No response

Steps to Reproduce

Couldn't reproduce

Expected Behavior

No unhandled exceptions

Screenshots

No response