diff --git a/app/helpers/exercises_helper.rb b/app/helpers/exercises_helper.rb
index cec6dd0ff..3595b5866 100644
--- a/app/helpers/exercises_helper.rb
+++ b/app/helpers/exercises_helper.rb
@@ -630,14 +630,16 @@ module ExercisesHelper
     user_score = nil
     shixun_type = 0
     question_comment = []
-    if q.question_type == 5
+    if ques_type == 5
       exercise_answers = q.exercise_shixun_answers.search_shixun_answers("user_id",ex_answerer_id)
     else
       exercise_answers = q.exercise_answers.search_exercise_answer("user_id",ex_answerer_id)  #试卷用户的回答
     end
     if student_status == 2   #当前为老师，或为学生且已提交
-      user_score = exercise_answers.score_reviewed.pluck(:score).sum
+      user_score_pre = exercise_answers.score_reviewed.pluck(:score).sum
+      user_score = user_score_pre.present? ? user_score_pre.pluck(:score).sum : nil
     end
+
     if user_score.present? && (user_score > q.question_score)
       user_score = q.question_score
     end
@@ -667,7 +669,7 @@ module ExercisesHelper
       question_comment = q.exercise_answer_comments.search_answer_comments("exercise_answer_id",q_answer_id)
     end
     {
-        "user_score": user_score.present? ? user_score.round(1) : nil,
+        "user_score": (user_score.present? ? user_score.round(1).to_s : nil),
         "answered_content":answered_content,
         "shixun_type":shixun_type,
         "question_comment":question_comment
diff --git a/app/jobs/homework_evaluation_comment_assgin_job.rb b/app/jobs/homework_evaluation_comment_assgin_job.rb
index 2579ea18b..5921386f2 100644
--- a/app/jobs/homework_evaluation_comment_assgin_job.rb
+++ b/app/jobs/homework_evaluation_comment_assgin_job.rb
@@ -16,7 +16,7 @@ class HomeworkEvaluationCommentAssginJob < ApplicationJob
       student_work_projects = homework_common.student_works.where("work_status != 0").shuffle
       student_work_projects.each do |pro_work|
         n = homework_detail_manual.evaluation_num
-        n = (n < student_works.size && n != -1) ? n : student_works.size - 1
+        n = (n < student_works.length && n != -1) ? n : student_works.length - 1
         work_index = -1
         student_works.each_with_index do |stu_work, stu_index|
           if stu_work.group_id.to_i == pro_work.group_id.to_i
diff --git a/app/models/homework_common.rb b/app/models/homework_common.rb
index c0882ec6f..6512c3f1d 100644
--- a/app/models/homework_common.rb
+++ b/app/models/homework_common.rb
@@ -170,7 +170,7 @@ class HomeworkCommon < ApplicationRecord
   #删除时更新题库中的引用数
   def update_homework_bank_quotes
     old_bank = self.homework_bank
-    old_bank.update_attributes(quotes: (old_bank.quotes - 1) > 0 ? (old_bank.quotes - 1) : 0, homework_common_id: nil)
+    old_bank.update_attributes(quotes: (old_bank.quotes - 1) > 0 ? (old_bank.quotes - 1) : 0, homework_common_id: nil) if old_bank.present?
   end
 
   # 查重是否有新结果
diff --git a/app/views/exercises/_user_exercise_info.json.jbuilder b/app/views/exercises/_user_exercise_info.json.jbuilder
index cc10f5bb7..1ff929897 100644
--- a/app/views/exercises/_user_exercise_info.json.jbuilder
+++ b/app/views/exercises/_user_exercise_info.json.jbuilder
@@ -47,14 +47,13 @@ end
 
 json.exercise_questions do
   json.array! exercise_questions do |q|
-
     user_ques_answers = user_question_answers(q,ex_answerer.id,student_status,is_teacher_or,exercise_status,q.question_type,ex_type)
     user_ques_comments = user_ques_answers[:question_comment]
     if all_question_status.size > 0
       this_ques_status = all_question_status.detect {|f| f[:q_id] == q.id}
       json.answer_status this_ques_status[:stand_status]
     end
-    json.user_score user_ques_answers[:user_score].present? ? user_ques_answers[:user_score].to_s : nil
+    json.user_score user_ques_answers[:user_score]
     json.partial! "exercise_questions/exercise_questions",
                   question: q,
                   ex_answerer: ex_answerer,