diff --git a/services/core.py b/services/core.py
index 4747a2e..3eda1f5 100644
--- a/services/core.py
+++ b/services/core.py
@@ -93,8 +93,10 @@ class CacheStorage:
             if result:
                 CacheStorage.authors = result
                 for a in result:
-                    self.authors_by_user[a.user] = a
-                    self.authors_by_id[a.id] = a
+                    user_id = a.get("user")
+                    author_id = a.get("id")
+                    self.authors_by_user[user_id] = a
+                    self.authors_by_id[author_id] = a
 
     @staticmethod
     async def worker():