diff --git a/src/thsf/__init__.py b/src/thsf/__init__.py
index fbd5cc9..5e3c434 100644
--- a/src/thsf/__init__.py
+++ b/src/thsf/__init__.py
@@ -63,7 +63,7 @@ def get_speaker_biography(name):
     logging.info(speaker_info)
     return speaker_info["results"][0]["biography"].strip()
   except Exception as err:
-    logging.error(f"UnknownSpeakerError: {name}")
+    logging.debug(f"UnknownSpeakerError: {name}")
     return None
 
 # ------------------------------------------------------------------------------