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

Zentorno · web-flow · commit f153b592412a · 2025-09-16T09:11:21.000+02:00
diff --git a/langfuse/openai.py b/langfuse/openai.py
@@ -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(
                             tool_call_chunk, "arguments", None
                         )

Original file line number	Diff line number	Diff line change
`@@ -641,6 +641,10 @@ def _extract_streamed_openai_response(resource: Any, chunks: Any) -> Any:`
`641`	`641`	`curr[-1]["name"] = curr[-1]["name"] or getattr(`
`642`	`642`	`tool_call_chunk, "name", None`
`643`	`643`	`)`
	`644`	`+`
	`645`	`+ if curr[-1]["arguments"] is None:`
	`646`	`+ curr[-1]["arguments"] = ""`
	`647`	`+`
`644`	`648`	`curr[-1]["arguments"] += getattr(`
`645`	`649`	`tool_call_chunk, "arguments", None`
`646`	`650`	`)`