diff --git a/Tiobon.Core.Services/Ghre/Ghre_CourseServices.cs b/Tiobon.Core.Services/Ghre/Ghre_CourseServices.cs
index a7fbdaa4..75530aa8 100644
--- a/Tiobon.Core.Services/Ghre/Ghre_CourseServices.cs
+++ b/Tiobon.Core.Services/Ghre/Ghre_CourseServices.cs
@@ -1,5 +1,4 @@
-using MathNet.Numerics.Distributions;
-using NPOI.SS.UserModel;
+using NPOI.SS.UserModel;
 using System.Net;
 using static Tiobon.Core.Model.Consts;
 
@@ -598,8 +597,8 @@ public class Ghre_CourseServices : BaseServices<Ghre_Course, Ghre_CourseDto, Ins
             if (!teacher.IsNull())
             {
                 entity.SchoolTeacherId = teacher.Id;
-                //entity.SchoolId = teacher.SchoolId;
             }
+            else entity.SchoolTeacherId = null;
         }
 
         if (await QueryCompanyCode() == "Ushio")
diff --git a/Tiobon.Core.Services/Ghre/Ghre_ExamServices.cs b/Tiobon.Core.Services/Ghre/Ghre_ExamServices.cs
index b8dfdb4c..1e565296 100644
--- a/Tiobon.Core.Services/Ghre/Ghre_ExamServices.cs
+++ b/Tiobon.Core.Services/Ghre/Ghre_ExamServices.cs
@@ -1158,10 +1158,21 @@ public class Ghre_ExamServices : BaseServices<Ghre_Exam, Ghre_ExamDto, InsertGhr
         if (pageData.AfterHowLong == 0)
             pageData.AfterHowLong = pageData.AfterHowLong1;
 
-        var course = await Db.Queryable<Ghre_Course>().Where(it => it.Id == pageData.CourseId).FirstAsync();
-        pageData.CoverUrl = course?.CoverUrl;
-        pageData.UseDefaultCoverImage = course?.UseDefaultCoverImage;
-        pageData.DefaultCoverImageName = course?.DefaultCoverImageName;
+        if (pageData.CourseId != null)
+        {
+
+            var course = await Db.Queryable<Ghre_Course>().Where(it => it.Id == pageData.CourseId).FirstAsync();
+            pageData.CoverUrl = course?.CoverUrl;
+            pageData.UseDefaultCoverImage = course?.UseDefaultCoverImage;
+            pageData.DefaultCoverImageName = course?.DefaultCoverImageName;
+        }
+        else if (pageData.CourseSceneId != null)
+        {
+            var course = await Db.Queryable<Ghre_CourseScene>().Where(it => it.Id == pageData.CourseSceneId).FirstAsync();
+            pageData.CoverUrl = course?.CoverUrl;
+            pageData.UseDefaultCoverImage = course?.UseDefaultCoverImage;
+            pageData.DefaultCoverImageName = course?.DefaultCoverImageName;
+        }
 
         if (string.IsNullOrWhiteSpace(pageData.ExamNo))
             pageData.ExamNo = await GenerateContinuousSequence();