diff --git a/IRaCIS.Core.Application/Service/Management/UserService.cs b/IRaCIS.Core.Application/Service/Management/UserService.cs
index cda31390b..d0b4ef427 100644
--- a/IRaCIS.Core.Application/Service/Management/UserService.cs
+++ b/IRaCIS.Core.Application/Service/Management/UserService.cs
@@ -1044,7 +1044,7 @@ namespace IRaCIS.Core.Application.Service
                 var lastLoginIPRegion = await _userLogRepository.Where(t => t.ActionUserName == actionUserName && userOptTypes.Contains(t.OptType))
                     .OrderByDescending(t => t.CreateTime).Select(t => t.IPRegion).FirstOrDefaultAsync();
 
-                if (lastLoginIPRegion != string.Empty)
+                if (lastLoginIPRegion!=null&&lastLoginIPRegion != string.Empty)
                 {
                     // 与上一次区域不一致
                     //if (SplitAndConcatenate(existUserLoginInfo.LastLoginIP) != SplitAndConcatenate(iPRegion))