diff --git a/process_request/clients.py b/process_request/clients.py
index 5eac82c..ca614d0 100644
--- a/process_request/clients.py
+++ b/process_request/clients.py
@@ -33,7 +33,13 @@ def __init__(self, baseurl, apikey):
              "X-AEON-API-KEY": apikey})
 
     def get_reading_rooms(self):
-        return self.get("ReadingRooms").json()
+        reading_rooms = self.get("ReadingRooms").json()
+        # Only pass along locations with open hours
+        open_reading_rooms = []
+        for reading_room in reading_rooms:
+            if len(reading_room["openHours"]):
+                open_reading_rooms.append(reading_room)
+        return open_reading_rooms
 
     def get_closures(self, reading_room_id):
         return self.get("/".join(["ReadingRooms", str(reading_room_id), "Closures"])).json()
diff --git a/process_request/helpers.py b/process_request/helpers.py
index 7df1ee0..a31bae4 100644
--- a/process_request/helpers.py
+++ b/process_request/helpers.py
@@ -471,4 +471,5 @@ def refresh_reading_room_cache():
     reading_rooms = aeon.get_reading_rooms()
     for reading_room in reading_rooms:
         reading_room["closures"] = aeon.get_closures(reading_room["id"])
+    ReadingRoomCache.objects.all().delete()
     return ReadingRoomCache.objects.update_or_create(defaults={'json': json.dumps(reading_rooms)})[0]
diff --git a/process_request/views.py b/process_request/views.py
index ee600a3..32f2e6c 100644
--- a/process_request/views.py
+++ b/process_request/views.py
@@ -153,6 +153,9 @@ def get(self, request):
             except ReadingRoomCache.DoesNotExist:
                 cached_reading_rooms = refresh_reading_room_cache()
                 cache_needs_refresh = False
+            except ReadingRoomCache.MultipleObjectsReturned:
+                cached_reading_rooms = ReadingRoomCache.objects.latest("timestamp")
+                cache_needs_refresh = True
             if cache_needs_refresh:
                 threading.Thread(target=refresh_reading_room_cache).start()
             return HttpResponse(cached_reading_rooms.json, content_type='application/json')