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Fix AttributeError when streaming chunk content is None #7153

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Fix AttributeError when streaming chunk content is None #7153

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@pavanmudumba pavanmudumba commented Dec 28, 2025 •
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Why are these changes needed?

The console streaming renderer unconditionally appends message.content from
ModelClientStreamingChunkEvent. In edge cases or malformed streams, this can
cause an AttributeError and crash the UI.

What was changed?

Added a defensive check to ensure message.content is not None before appending
it to the streaming buffer. This does not change behavior for valid streaming
chunks and prevents UI crashes.

Related issue number

Fixes #7130

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