diff --git a/IRaCIS.Core.Application/Service/SiteSurvey/TrialSiteSurveyService.cs b/IRaCIS.Core.Application/Service/SiteSurvey/TrialSiteSurveyService.cs
index 8ef7d98b2..8a8181101 100644
--- a/IRaCIS.Core.Application/Service/SiteSurvey/TrialSiteSurveyService.cs
+++ b/IRaCIS.Core.Application/Service/SiteSurvey/TrialSiteSurveyService.cs
@@ -988,7 +988,8 @@ namespace IRaCIS.Core.Application.Contracts
 
                     foreach (var userTypeId in userTypeIdList)
                     {
-                        var findTrialUserRole = findTrialUser.TrialUserRoleList.Where(t => t.UserRole.UserTypeId == userTypeId).FirstOrDefault();
+                        //userRole 可能为null
+                        var findTrialUserRole = findTrialUser.TrialUserRoleList.Where(t => t.UserRole?.UserTypeId == userTypeId).FirstOrDefault();
 
                         if (findTrialUserRole == null)
                         {
@@ -1193,7 +1194,7 @@ namespace IRaCIS.Core.Application.Contracts
 
                     foreach (var userTypeId in userTypeIdList)
                     {
-                        var findTrialUserRole = findTrialUser.TrialUserRoleList.Where(t => t.UserRole.UserTypeId == userTypeId).FirstOrDefault();
+                        var findTrialUserRole = findTrialUser.TrialUserRoleList.Where(t => t.UserRole?.UserTypeId == userTypeId).FirstOrDefault();
 
                         if (findTrialUserRole == null)
                         {
diff --git a/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs b/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs
index f77d0e177..31d253d81 100644
--- a/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs
+++ b/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs
@@ -360,7 +360,7 @@ namespace IRaCIS.Core.Application.Service
 
                     foreach (var userTypeId in userTypeIdList)
                     {
-                        var findTrialUserRole = findTrialUser.TrialUserRoleList.Where(t => t.UserRole.UserTypeId == userTypeId).FirstOrDefault();
+                        var findTrialUserRole = findTrialUser.TrialUserRoleList.Where(t => t.UserRole?.UserTypeId == userTypeId).FirstOrDefault();
 
                         if (findTrialUserRole == null)
                         {
diff --git a/IRaCIS.Core.Application/Service/WorkLoad/EnrollService.cs b/IRaCIS.Core.Application/Service/WorkLoad/EnrollService.cs
index 05ebbfe2a..bcb634798 100644
--- a/IRaCIS.Core.Application/Service/WorkLoad/EnrollService.cs
+++ b/IRaCIS.Core.Application/Service/WorkLoad/EnrollService.cs
@@ -442,7 +442,7 @@ namespace IRaCIS.Core.Application.Service
 
                                 }
 
-                                var findTrialUserRole = findTrialUser.TrialUserRoleList.Where(t => t.UserRole.UserTypeId == userRoleId).FirstOrDefault();
+                                var findTrialUserRole = findTrialUser.TrialUserRoleList.Where(t => t.UserRole?.UserTypeId == userRoleId).FirstOrDefault();
 
                                 if (findTrialUserRole == null)
                                 {