diff --git a/apps/tag/management/commands/sync_livestock.py b/apps/tag/management/commands/sync_livestock.py
index 5146766..84b4aa4 100644
--- a/apps/tag/management/commands/sync_livestock.py
+++ b/apps/tag/management/commands/sync_livestock.py
@@ -106,7 +106,7 @@ class Command(BaseCommand):
             birthdate = parse_birthdate(temp.birthdate)
             gender = 1 if temp.gender == 'M' else 2
             livestock_type = livestock_types.get(temp.species)
-            weight_type = livestock_type.weight_type
+            weight_type = livestock_type.weight_type if livestock_type else 'L'
 
             key = (self.normalize_herd_code(temp.herd_code), birthdate, gender)
             livestock = livestock_map.get(key)