[BUG]: Null reference in AskAsync()

[srulyg]

Description

Reproduction Steps

Just use the code in screenshot.

Environment & Configuration

• Operating system:
• .NET runtime version:
• LLamaSharp version:
• CUDA version (if you are using cuda backend):
• CPU & GPU device:

Known Workarounds

No response

[aropb]

Apparently it's the same mistake:
#891

[github-actions]

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