diff --git a/frontends/src/jp/cmd_roster.py b/frontends/src/jp/cmd_roster.py
index 9f31ed70..c0a1dd36 100644
--- a/frontends/src/jp/cmd_roster.py
+++ b/frontends/src/jp/cmd_roster.py
@@ -149,8 +149,16 @@ class Stats(base.CommandBase):
         print "Contacts with no subscription at all: %d" % no_sub
         print
         print "Total number of groups: %d" % len(unique_groups)
-        print "Average contacts per group: %.1f" % (float(total_group_subscription) / len(unique_groups))
-        print "Average groups' subscriptions per contact: %.1f" % (float(total_group_subscription) / len(contacts))
+        try:
+            contacts_per_group = float(total_group_subscription) / len(unique_groups)
+        except ZeroDivisionError:
+            contacts_per_group = 0
+        print "Average contacts per group: {:.1f}".format(contacts_per_group)
+        try:
+            groups_per_contact = float(total_group_subscription) / len(contacts)
+        except ZeroDivisionError:
+            groups_per_contact = 0
+        print "Average groups' subscriptions per contact: {:.1f}".format(groups_per_contact)
         print "Contacts not assigned to any group: %d" % no_group
         self.host.quit()