diff --git a/SolarPower/Controllers/OperationController.cs b/SolarPower/Controllers/OperationController.cs
index 652667a..8608b20 100644
--- a/SolarPower/Controllers/OperationController.cs
+++ b/SolarPower/Controllers/OperationController.cs
@@ -677,7 +677,7 @@ namespace SolarPower.Controllers
                                     _ => ""
                                 };
                                 var user = await userRepository.GetOneAsync(person);
-                                if (IsValidEmail(user.Email))
+                                if (user.Email != null && IsValidEmail(user.Email))
                                 {
                                     NoticeSchedule schedule = new NoticeSchedule()
                                     {
@@ -721,7 +721,7 @@ namespace SolarPower.Controllers
                             };
                             //var powerstation = await powerStationRepository.GetOneAsync(post.PowerStationId);
                             var firm = await operationRepository.GetOneWithCustomDBNameAndTableAsync<OperationInfo>(post.FixFirm, powerstations.SiteDB, "operation_firm");
-                            if (IsValidEmail(firm.Email))
+                            if (firm.Email != null && IsValidEmail(firm.Email))
                             {
                                 NoticeSchedule schedule = new NoticeSchedule()
                                 {
@@ -909,7 +909,7 @@ namespace SolarPower.Controllers
                                     _ => ""
                                 };
                                 var user = await userRepository.GetOneAsync(person);
-                                if (IsValidEmail(user.Email))
+                                if (user.Email != null && IsValidEmail(user.Email))
                                 {
                                     NoticeSchedule schedule = new NoticeSchedule()
                                     {
@@ -952,7 +952,7 @@ namespace SolarPower.Controllers
                             };
                            // var powerstation = await powerStationRepository.GetOneAsync(post.PowerStationId);
                             var firm = await operationRepository.GetOneWithCustomDBNameAndTableAsync<OperationInfo>(post.FixFirm, powerstations.SiteDB, "operation_firm");
-                            if (IsValidEmail(firm.Email))
+                            if (firm.Email != null && IsValidEmail(firm.Email))
                             {
                                 NoticeSchedule schedule = new NoticeSchedule()
                                 {
diff --git a/SolarPower/Quartz/Jobs/OperationScheduleJob.cs b/SolarPower/Quartz/Jobs/OperationScheduleJob.cs
index 43e9001..911a475 100644
--- a/SolarPower/Quartz/Jobs/OperationScheduleJob.cs
+++ b/SolarPower/Quartz/Jobs/OperationScheduleJob.cs
@@ -250,7 +250,7 @@ namespace SolarPower.Quartz.Jobs
                             var stationReportName = stationReportController.ExportExcelBackDownload(JsonConvert.SerializeObject(dayexcel, Formatting.Indented));
                             if (stationReportName != "")
                             {
-                                if (IsValidEmail(user.Email))
+                                if (user.Email != null && IsValidEmail(user.Email))
                                 {
                                     NoticeSchedule DaySchedule = new NoticeSchedule()
                                     {
@@ -288,7 +288,7 @@ namespace SolarPower.Quartz.Jobs
                                 Userid = user.Id
                             };
                             var stationMaxReportName = stationReportController.ExportExcelmaxtableBackDownload(JsonConvert.SerializeObject(maxdayexcel, Formatting.Indented));
-                            if (IsValidEmail(user.Email))
+                            if (user.Email != null && IsValidEmail(user.Email))
                             {
                                 NoticeSchedule MaxSchedule = new NoticeSchedule()
                                 {
@@ -324,7 +324,7 @@ namespace SolarPower.Quartz.Jobs
                                     Userid = user.Id
                                 };
                                 var stationReportmaxmonthName = stationReportController.ExportExcelBackDownload(JsonConvert.SerializeObject(maxmonthexcel, Formatting.Indented));
-                                if (IsValidEmail(user.Email))
+                                if (user.Email != null && IsValidEmail(user.Email))
                                 {
                                     NoticeSchedule MaxmonthSchedule = new NoticeSchedule()
                                     {
@@ -370,7 +370,7 @@ namespace SolarPower.Quartz.Jobs
                             var stationReportmonthName = stationReportController.ExportExcelBackDownload(JsonConvert.SerializeObject(monthexcel, Formatting.Indented));
                             if (stationReportmonthName != "")
                             {
-                                if (IsValidEmail(user.Email))
+                                if (user.Email != null && IsValidEmail(user.Email))
                                 {
                                     NoticeSchedule MonthSchedule = new NoticeSchedule()
                                     {
diff --git a/SolarPower/Quartz/Jobs/SendEmailJob.cs b/SolarPower/Quartz/Jobs/SendEmailJob.cs
index 0c6897b..25ac79f 100644
--- a/SolarPower/Quartz/Jobs/SendEmailJob.cs
+++ b/SolarPower/Quartz/Jobs/SendEmailJob.cs
@@ -44,7 +44,7 @@ namespace SolarPower.Quartz.Jobs
                 var updateNoticeSchedules = new List<NoticeSchedule>();
                 foreach (var notice in noticeSchedules)
                 {
-                    if (IsValidEmail(notice.RecipientEmail)) {
+                    if (notice.RecipientEmail != null && IsValidEmail(notice.RecipientEmail)) {
                         var attachments = new List<string>();
                         var recipientEmails = new List<string>()
                         {
diff --git a/SolarPower/Repository/Implement/OperationRepository.cs b/SolarPower/Repository/Implement/OperationRepository.cs
index 1fe58e6..2ba0976 100644
--- a/SolarPower/Repository/Implement/OperationRepository.cs
+++ b/SolarPower/Repository/Implement/OperationRepository.cs
@@ -649,7 +649,7 @@ namespace SolarPower.Repository.Implement
                         List<string> value = new List<string>();
                         foreach (MyUser a in personal)
                         {
-                            if (IsValidEmail(a.Email))
+                            if (a.Email != null && IsValidEmail(a.Email))
                             {
                                 value.Add($@"(1,'{a.Name}','{a.Email}','{Title}','{content}',{a.Id}, {emailType})");
                             }