diff --git a/src/c3nav/mapdata/utils/cache/local.py b/src/c3nav/mapdata/utils/cache/local.py
index f0fd97e6..8d9b2385 100644
--- a/src/c3nav/mapdata/utils/cache/local.py
+++ b/src/c3nav/mapdata/utils/cache/local.py
@@ -32,6 +32,9 @@ class LocalCacheProxy:
             # not in our cache
             result = cache.get(key, default=NoneFromCache)
             if result is not NoneFromCache:
+                print("result", result, result is NoneFromCache)
+                if self._items.get(None) is None:
+                    self._items.set(OrderedDict())
                 self._items.get()[key] = result
                 self._prune()
             else: