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fix(openai): handle None arguments in tool calls #1339

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Sep 16, 2025
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fix(openai): handle None arguments in tool calls #1339

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4 changes: 4 additions & 0 deletions langfuse/openai.py
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Original file line number Diff line number Diff line change
Expand Up @@ -641,6 +641,10 @@ def _extract_streamed_openai_response(resource: Any, chunks: Any) -> Any:
curr[-1]["name"] = curr[-1]["name"] or getattr(
tool_call_chunk, "name", None
)

if curr[-1]["arguments"] is None:
curr[-1]["arguments"] = ""

curr[-1]["arguments"] += getattr(
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Good fix: initializing curr[-1]['arguments'] as empty string avoids TypeError. However, consider also defaulting the getattr call (e.g. using '' instead of None) so that if tool_call_chunk.arguments is None, concatenation won’t fail.

tool_call_chunk, "arguments", None
)
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