diff --git a/src/comissions.app.api/Middleware/UserMiddleware.cs b/src/comissions.app.api/Middleware/UserMiddleware.cs
index 0435e0d..35baf64 100644
--- a/src/comissions.app.api/Middleware/UserMiddleware.cs
+++ b/src/comissions.app.api/Middleware/UserMiddleware.cs
@@ -32,6 +32,7 @@ public class UserMiddleware
             if (user == null)
             {
                 var displayName = context.User.Claims.FirstOrDefault(x=>x.Type==ClaimTypes.Name)?.Value ?? "Anonymous";
+                if(dbContext.Users.Any(x=>x.DisplayName==displayName))
                     displayName = $"{displayName}#{Guid.NewGuid().ToString().Substring(0, 4)}";
                 user = new User
                 {