diff --git a/openslides/poll/models.py b/openslides/poll/models.py
index e24494aad..a5beac578 100644
--- a/openslides/poll/models.py
+++ b/openslides/poll/models.py
@@ -82,7 +82,10 @@ class CountVotesCast(models.Model):
         return print_value(self.votescast)
 
     def percent_base(self):
-        return 100 / float(self.votescast)
+        try:
+            return 100 / float(self.votescast)
+        except TypeError:
+            return 0
 
     class Meta:
         abstract = True