diff --git a/YD_Event.Application/Client/OAuthController.cs b/YD_Event.Application/Client/OAuthController.cs
index 573d39d..76ad40e 100644
--- a/YD_Event.Application/Client/OAuthController.cs
+++ b/YD_Event.Application/Client/OAuthController.cs
@@ -58,7 +58,7 @@ public class OAuthController : IDynamicApiController
         
         if (!isRegistered)
         {
-            if (string.IsNullOrEmpty(appUser.Password))
+            if (appUser == null || string.IsNullOrEmpty(appUser.Password))
             {
                 throw Oops.Bah("未注册过账户");
             }