diff --git a/sbws/lib/v3bwfile.py b/sbws/lib/v3bwfile.py
index 9a303bed19ed5ef15e35325622e5468543a601eb..8c5b9a9ceff0f7b015cf74dbc81ffc9abf9b5739 100644
--- a/sbws/lib/v3bwfile.py
+++ b/sbws/lib/v3bwfile.py
@@ -902,7 +902,8 @@ class V3BWLine(object):
             if r.relay_observed_bandwidth is not None:
                 desc_bw_obs_ls.append(r.relay_observed_bandwidth)
         if desc_bw_obs_ls:
-            return max(round(mean(desc_bw_obs_ls)), 1)
+            return round(mean(desc_bw_obs_ls))
+        log.warning("Descriptor observed bandwidth is None.")
         return None
 
     @staticmethod