diff --git a/IRaCIS.Core.Application/Service/Reading/ReadingPeriod/ReadModuleService.cs b/IRaCIS.Core.Application/Service/Reading/ReadingPeriod/ReadModuleService.cs
index 2164e4bdb..a8de462dc 100644
--- a/IRaCIS.Core.Application/Service/Reading/ReadingPeriod/ReadModuleService.cs
+++ b/IRaCIS.Core.Application/Service/Reading/ReadingPeriod/ReadModuleService.cs
@@ -856,7 +856,7 @@ namespace IRaCIS.Core.Application.Service
             {
 
                 x.IsGenerateTask= taskList.Any(t => t.SouceReadModuleId == x.Id);
-                x.GenerateTaskTime= taskList.Where(t => t.SouceReadModuleId == x.Id).OrderByDescending(t => t.CreateTime).Select(t => t.CreateTime).FirstOrDefault();
+                x.GenerateTaskTime= taskList.Any(t => t.SouceReadModuleId == x.Id)?   taskList.Where(t => t.SouceReadModuleId == x.Id).OrderByDescending(t => t.CreateTime).Select(t => t.CreateTime).FirstOrDefault():null;
 
             });
             return pageList;