observability-data-serialization-numpy-numeric-types-e-g-numpy-float32-in-document--1a2178e3

THEN Upgrade langfuse-python SDK to version 2.50.3 or later, which includes a fix for serializing numpy numeric types. If you cannot upgrade immediately, manually convert numpy scalars to native Python types (e.g., score.item()) before adding them to trace metadata or document fields.

# Convert numpy.float32 to native float before logging
score = float32_value.item()  # or use float(float32_value)
trace.input = {'relevance_score': score}