From 025684407480934eb8bac81eb53ce80744ee3e2d Mon Sep 17 00:00:00 2001
From: AnonymousDotNet <18776095145@163.com>
Date: Wed, 30 Oct 2024 18:22:24 +0800
Subject: [PATCH] fix: NullReferenceException

---
 .../Repository/MongoRepository.User.cs                          | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Plugins/BotSharp.Plugin.MongoStorage/Repository/MongoRepository.User.cs b/src/Plugins/BotSharp.Plugin.MongoStorage/Repository/MongoRepository.User.cs
index 33cd16e8..7c19dc2a 100644
--- a/src/Plugins/BotSharp.Plugin.MongoStorage/Repository/MongoRepository.User.cs
+++ b/src/Plugins/BotSharp.Plugin.MongoStorage/Repository/MongoRepository.User.cs
@@ -14,7 +14,7 @@ public partial class MongoRepository
     public User? GetUserByPhone(string phone)
     {
         string phoneSecond = string.Empty;
-        if (phone.Substring(0, 3) != "+86")
+        if (phone.Length >= 4 && phone.Substring(0, 3) != "+86")
         {
             phoneSecond = $"+86{phone}";
         }