diff --git a/anki/graphs.py b/anki/graphs.py
index 3364e11e2..11ba582b5 100644
--- a/anki/graphs.py
+++ b/anki/graphs.py
@@ -98,12 +98,15 @@ table * { font-size: 14px; }
         else:
             days = num*30
         vals = []
-        vals.append(_("%d/day") % (tot/days))
-        if self.type > 0:
-            vals.append(_("%d/week") % (tot/(days/7)))
-        if self.type > 1:
-            vals.append(_("%d/month") % (tot/(days/30)))
-        txt = _("Average reviews: <b>%s</b>") % ", ".join(vals)
+        try:
+            vals.append(_("%d/day") % (tot/days))
+            if self.type > 0:
+                vals.append(_("%d/week") % (tot/(days/7)))
+            if self.type > 1:
+                vals.append(_("%d/month") % (tot/(days/30)))
+            txt = _("Average reviews: <b>%s</b>") % ", ".join(vals)
+        except ZeroDivisionError:
+            return ""
         return txt
 
     def _due(self, start=None, end=None, chunk=1):
@@ -367,9 +370,10 @@ where 1 """ + self._limit())
         self._line(i, _("Total Cards"), c)
         self._line(i, _("Total Facts"), f)
         (low, avg, high) = self._factors()
-        self._line(i, _("Lowest ease factor"), "%d%%" % low)
-        self._line(i, _("Average ease factor"), "%d%%" % avg)
-        self._line(i, _("Highest ease factor"), "%d%%" % high)
+        if low:
+            self._line(i, _("Lowest ease factor"), "%d%%" % low)
+            self._line(i, _("Average ease factor"), "%d%%" % avg)
+            self._line(i, _("Highest ease factor"), "%d%%" % high)
         min = self.deck.db.scalar(
             "select min(crt) from cards where 1 " + self._limit())
         if min:
diff --git a/tests/test_sched.py b/tests/test_sched.py
index 35ef0fd3f..ff8c7dbc0 100644
--- a/tests/test_sched.py
+++ b/tests/test_sched.py
@@ -598,7 +598,7 @@ def test_groupCounts():
     # and one that's a child
     f = d.newFact()
     f['Front'] = u"two"
-    f.gid = d.groupId("Default Group::1")
+    f.gid = d.groupId("Default::1")
     d.addFact(f)
     # make it a review card
     c = f.cards()[0]
@@ -619,12 +619,12 @@ def test_groupCounts():
     assert d.sched.counts() == (3, 0, 1)
     assert len(d.groups()) == 4
     cnts = d.sched.groupCounts()
-    assert cnts[0] == ["Default Group", 1, 1, 0, 1]
-    assert cnts[1] == ["Default Group::1", 2, 1, 1, 0]
+    assert cnts[0] == ["Default", 1, 1, 0, 1]
+    assert cnts[1] == ["Default::1", 2, 1, 1, 0]
     assert cnts[2] == ["foo::bar", 3, 1, 0, 1]
     assert cnts[3] == ["foo::baz", 4, 1, 0, 1]
     tree = d.sched.groupCountTree()
-    assert tree[0][0] == "Default Group"
+    assert tree[0][0] == "Default"
     # sum of child and parent
     assert tree[0][1] == 1
     assert tree[0][2] == 2