diff --git a/mopidy_local/commands.py b/mopidy_local/commands.py
index f195614..cb633ce 100644
--- a/mopidy_local/commands.py
+++ b/mopidy_local/commands.py
@@ -221,6 +221,11 @@ def _scan_metadata(
                     logger.warning(
                         f"Failed scanning {file_uri}: No audio found in file"
                     )
+                elif result.duration is None:
+                    logger.warning(
+                        f"Failed scanning {file_uri}: "
+                        "No duration information found in file"
+                    )
                 elif result.duration < MIN_DURATION_MS:
                     logger.warning(
                         f"Failed scanning {file_uri}: "