diff --git a/tipp/views.py b/tipp/views.py
index 4c1abac..a629a81 100644
--- a/tipp/views.py
+++ b/tipp/views.py
@@ -397,8 +397,11 @@ def charts(request, ls, season, pos='default', template_name='charts.html'):
             # get user object, then fetch matches for user
             user = User.objects.get(id=userid)
             score = Tipp.objects.filter(matchID__in=matches, tipperID=user).aggregate(Sum('score'))
-
-            user_dict[user.first_name] = score['score__sum']
+            
+            if score['score__sum'] is None:
+                user_dict[user.first_name] = 0
+            else:
+                user_dict[user.first_name] = score['score__sum']
 
         mandant_dict[mandant.name] = sorted(user_dict.items(), key=lambda x: x[1], reverse=True)