pipecat/changelog/4440.fixed.md

• Fixed a race condition in the Daily transport that caused AttributeError: 'NoneType' object has no attribute 'send_app_message' when tearing down a pipeline. Both DailyInputTransport and DailyOutputTransport share the same DailyTransportClient and both call cleanup(), which was releasing the underlying CallClient on the first call — leaving the second caller with a None client.