diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index ce9c9af6c..106ba3dd4 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -1129,12 +1129,12 @@ class CoursesController < ApplicationController
 
   def validate_course_name
     tip_exception("课堂名称不能为空！") if params[:course][:name].blank?
-    if params[:subject_id].blank? || @course.subject.blank?
+    if params[:subject_id].blank? || (@course && @course.subject.blank?)
       tip_exception("课程名称不能为空！") if params[:course_list_name].blank?
       tip_exception("课堂名称应以课程名称开头命名") unless params[:course][:name].index(params[:course_list_name]) &&
         params[:course][:name].index(params[:course_list_name]) == 0
     else
-      @subject = @course ? @course.subject : Subject.find_by!(id: params[:subject_id])
+      @subject = @course.present? ? @course.subject : Subject.find_by!(id: params[:subject_id])
       tip_exception("开始时间不能为空") if params[:start_date].blank?
       tip_exception("结束时间不能为空") if params[:end_date].blank?
       tip_exception("结束时间必须晚于开始时间") if params[:end_date] <= params[:start_date]
diff --git a/app/controllers/myshixuns_controller.rb b/app/controllers/myshixuns_controller.rb
index c36ad09b6..69bd01dde 100644
--- a/app/controllers/myshixuns_controller.rb
+++ b/app/controllers/myshixuns_controller.rb
@@ -23,24 +23,19 @@ class MyshixunsController < ApplicationController
     begin
       ActiveRecord::Base.transaction do
         begin
-          @shixun = Shixun.select(:id, :identifier).find(@myshixun.shixun_id)
+          @shixun = Shixun.select(:id, :identifier, :challenges_count).find(@myshixun.shixun_id)
           @myshixun.destroy!
-
           StudentWork.where(:myshixun_id => @myshixun.id).update_all(:myshixun_id => 0, :work_status => 0)
-
-          # 实训在申请发布前，是否玩过实训，如果玩过需要更改记录，防止二次重置
-          shixun_mod = ShixunModify.where(:shixun_id => @shixun.id, :myshixun_id => @myshixun.id, :status => 1).take
-          shixun_mod.update_column(:status, 0) if shixun_mod
         rescue Exception => e
           logger.error("######reset_my_game_failed:#{e.message}")
           raise("ActiveRecord::RecordInvalid")
         end
       end
       # 删除版本库
-      GitService.delete_repository(repo_path: @repo_path)
+      GitService.delete_repository(repo_path: @repo_path) unless @shixun.is_choice_type?
     rescue Exception => e
       if e.message != "ActiveRecord::RecordInvalid"
-        logger.error("######delete_repository_error:#{e.message}")
+        logger.error("######delete_repository_error-:#{e.message}")
       end
       raise "delete_repository_error:#{e.message}"
     end
diff --git a/app/models/course.rb b/app/models/course.rb
index bab02be01..b7bea6ec0 100644
--- a/app/models/course.rb
+++ b/app/models/course.rb
@@ -5,7 +5,7 @@ class Course < ApplicationRecord
 
   belongs_to :teacher, class_name: 'User', foreign_key: :tea_id  # 定义一个方法teacher，该方法通过tea_id来调用User表
   belongs_to :school, class_name: 'School', foreign_key: :school_id #定义一个方法school，该方法通过school_id来调用School表
-  belongs_to :course_list
+  belongs_to :course_list, optional: true
 
   # 所属实践课程
   belongs_to :subject, optional: true
@@ -91,7 +91,7 @@ class Course < ApplicationRecord
   NORMAL = 6      # 普通用户
   Anonymous = 7      # 普未登录
 
-  validates :name, presence: true, length: { maximum: 30 }
+  validates :name, presence: true, length: { maximum: 60 }
 
   after_create :create_board_sync, :act_as_course_activity, :send_tiding
 
diff --git a/app/views/courses/settings.json.jbuilder b/app/views/courses/settings.json.jbuilder
index 1a67fbe27..be4470a66 100644
--- a/app/views/courses/settings.json.jbuilder
+++ b/app/views/courses/settings.json.jbuilder
@@ -1,5 +1,5 @@
-json.course_list_id @course.course_list.id
-json.course_list_name @course.course_list.name
+json.course_list_id @course.course_list&.id
+json.course_list_name @course.course_list&.name
 json.name @course.name
 json.course_id @course.id
 json.school @course.school&.name
diff --git a/dump.rdb b/dump.rdb
index c4edd44ed..d3784bb93 100644
Binary files a/dump.rdb and b/dump.rdb differ