diff --git a/Fuyu.Backend.Core/Services/AccountService.cs b/Fuyu.Backend.Core/Services/AccountService.cs
index b22efd7..a8e3d30 100644
--- a/Fuyu.Backend.Core/Services/AccountService.cs
+++ b/Fuyu.Backend.Core/Services/AccountService.cs
@@ -138,6 +138,12 @@ public static ERegisterStatus RegisterGame(string sessionId, string game, string
         {
             var account = CoreOrm.GetAccount(sessionId);
 
+            // TODO: refactor the account to only have one aid per game
+            if (account.Games.TryGetValue(game, out var aids) && aids.Count > 0)
+            {
+                return ERegisterStatus.AlreadyExists;
+            }
+
             string address;
 
             switch (game)