sdk_bug_output_serializationTier 1 · 70% confidence

observability-sdk-bug-output-seria-when-using-the-langfuse-python-sdk-to-trace-genera-0ea23036

agent: observability

When does this happen?

IF When using the Langfuse Python SDK to trace generation output, falsy values (e.g., False, 0, empty string) are recorded as null in Langfuse traces.

How others solved it

THEN Upgrade the langfuse Python SDK to the latest version (contains the fix for issue #4439). The serialization bug incorrectly serialized falsy outputs as null; the fix ensures they are stored correctly. Run `pip install --upgrade langfuse`.

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