NullException when model responds

[dr-graviton]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [x ] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

1. Pull the latest code.

2. Run dotnet/samples/console-from-mic
3. Say anything

Any log messages given by the failure

• Connecting to Azure OpenAI endpoint (AZURE_OPENAI_ENDPOINT): https://***.openai.azure.com/

• Using API key (AZURE_OPENAI_API_KEY): cdcb3**
• Using deployment (AZURE_OPENAI_DEPLOYMENT): gpt-4o-realtime-preview
  <<< Connected: session started

Listening to microphone input
(Just tell the app you're done to finish)

<<< Start of speech detected @ 00:00:11.0400000
<<< End of speech detected @ 00:00:11.5200000

USER: Hi.

Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
at SpeakerOutput.EnqueueForPlayback(BinaryData audioData) in C:\sandbox\aoai-realtime-audio-sdk\dotnet\samples\console-from-mic\SpeakerOutput.cs:line 29
at Program.Main(String[] args) in C:\sandbox\aoai-realtime-audio-sdk\dotnet\samples\console-from-mic\Program.cs:line 93
at Program.Main(String[] args) in C:\sandbox\aoai-realtime-audio-sdk\dotnet\samples\console-from-mic\Program.cs:line 42
at Program.

(String[] args)

Expected/desired behavior

It should play the model output

OS and Version?

Windows 11

Versions

23H2

Mention any other details that might be useful

This works fine on the commit: 9d5f530

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