--- a/query.py
+++ b/query.py
@@ -70,6 +70,9 @@
                 slots['{0}-{1}'.format(date1.strftime('%H'), date2.strftime('%H'))] = result.filter(self.t.lt.calldate.between(date1, date2)).count()
 
         maxLoad = max(slots, key = lambda x: slots.get(x) )
-        minLoad = min(slots, key = lambda x: slots.get(x) )
-        return {"maxLoad": maxLoad, "maxCalls": slots[maxLoad], "minLoad": minLoad}
+        minLoad = []
+        for slot in slots:
+            if min(slots, slots[slot]) == 0:
+                minLoad.append(slot)
+        return {"maxLoad": maxLoad, "maxCalls": slots[maxLoad], "minLoad": repr(minLoad)}