diff --git a/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/Exam_ExamStudent/Exam_ExamStudentService.cs b/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/Exam_ExamStudent/Exam_ExamStudentService.cs
index 92370ceb7..017249afb 100644
--- a/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/Exam_ExamStudent/Exam_ExamStudentService.cs	
+++ b/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/Exam_ExamStudent/Exam_ExamStudentService.cs	
@@ -140,7 +140,10 @@ namespace Learun.Application.TwoDevelopment.EducationalAdministration
                 if (!queryParam["EPId"].IsEmpty())
                 {
                     var examPlan = this.BaseRepository("CollegeMIS").FindEntity<Exam_ExamPlanEntity>(queryParam["EPId"].ToString());
-                    strSql.Append($" AND t.AcademicYearNo = '{examPlan.AcademicYearNo}'  AND t.Semester = '{examPlan.Semester}'   AND t.ESType = '{examPlan.PlanType}' ");
+                    if (examPlan != null)
+                    {
+                        strSql.Append($" AND t.AcademicYearNo = '{examPlan.AcademicYearNo}'  AND t.Semester = '{examPlan.Semester}'   AND t.ESType = '{examPlan.PlanType}' ");
+                    }
                 }
                 strSql.Append(" group by ClassNo,AcademicYearNo,Semester,ESType  ");
                 return this.BaseRepository("CollegeMIS").FindList<Exam_ExamStudentEntity>(strSql.ToString(), dp, pagination);