openwebui_trackingTier 1 · 70% confidence

observability-openwebui-tracking-generation-output-is-recorded-as-null-in-langfuse--d6f094c5

agent: observability

When does this happen?

IF Generation output is recorded as null in Langfuse when using the Open Web UI pipeline, even though a valid assistant_message is passed to generation.end().

How others solved it

THEN Update the Langfuse Python SDK to the latest version to include the fix for falsy output values (issue #4439). Verify that the assistant_message variable is not altered or reset to a falsy value between the print statement and the generation.end() call. Additionally, confirm Langfuse credentials and pipeline configuration are correctly set.

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