diff --git a/flask_discord/models/user.py b/flask_discord/models/user.py
index b201fb8..5e015da 100644
--- a/flask_discord/models/user.py
+++ b/flask_discord/models/user.py
@@ -114,7 +114,7 @@ class User(DiscordModelsBase):
         [cls, ...]
             List of instances of this model when many of these models exist."""
         self = super().fetch_from_api()
-        app.discord.users_cache.update({self.id: self})
+        current_app.discord.users_cache.update({self.id: self})
         session["DISCORD_USER_ID"] = self.id
 
         if guilds: