diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index e0fdafec..6884167a 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -955,7 +955,7 @@ class HandoverSerializer(CustomModelSerializer):
         for ind, item in enumerate(attrs['handoverb']):
             wm = item["wm"]
             if tracking == Material.MA_TRACKING_SINGLE:
-                handoverbw = item["handoverbw"]
+                handoverbw = item.get("handoverbw", [])
                 if handoverbw:
                     t_count += len(handoverbw)
                 elif wm.count == item["count"]: