diff --git a/db/migrate/20160224074034_update_one_student_score.rb b/db/migrate/20160224074034_update_one_student_score.rb
index 6e1930652..454bd8acd 100644
--- a/db/migrate/20160224074034_update_one_student_score.rb
+++ b/db/migrate/20160224074034_update_one_student_score.rb
@@ -1,35 +1,39 @@
 class UpdateOneStudentScore < ActiveRecord::Migration
   def up
-    student_work_score = StudentWorksScore.where("user_id = 11688 AND student_work_id = 34414").first
-    student_work_score.score = 100
-    student_work_score.save
-    student_works = StudentWork.where("user_id = 6456")
-    student_works.each do |work|
-      unless work.student_works_scores.empty?
-        if work.student_works_scores.where(:reviewer_role => 2).empty?
-          work.teaching_asistant_score = nil
-        else
-          work.teaching_asistant_score = work.student_works_scores.where(:reviewer_role => 2).average(:score).try(:round, 2).to_f
+    begin
+      student_work_score = StudentWorksScore.where("user_id = 11688 AND student_work_id = 34414").first
+      student_work_score.score = 100
+      student_work_score.save
+      student_works = StudentWork.where("user_id = 6456")
+      student_works.each do |work|
+        unless work.student_works_scores.empty?
+          if work.student_works_scores.where(:reviewer_role => 2).empty?
+            work.teaching_asistant_score = nil
+          else
+            work.teaching_asistant_score = work.student_works_scores.where(:reviewer_role => 2).average(:score).try(:round, 2).to_f
+          end
+          if work.student_works_scores.where(:reviewer_role => 3).empty?
+            work.student_score = nil
+          else
+            work.student_score = work.student_works_scores.where(:reviewer_role => 3).average(:score).try(:round, 2).to_f
+          end
         end
-        if work.student_works_scores.where(:reviewer_role => 3).empty?
-          work.student_score = nil
+        if work.teaching_asistant_score.nil?
+          work.final_score = work.student_score
+        elsif work.student_score.nil?
+          work.final_score = work.teaching_asistant_score
         else
-          work.student_score = work.student_works_scores.where(:reviewer_role => 3).average(:score).try(:round, 2).to_f
+          homework = HomeworkCommon.find work.homework_common_id
+          ta_proportion = homework.homework_detail_manual.ta_proportion
+          final_ta_score = BigDecimal.new("#{work.teaching_asistant_score}") * BigDecimal.new("#{ta_proportion}")
+          final_s_score = BigDecimal.new("#{work.student_score}") * (BigDecimal.new('1.0')  - BigDecimal.new("#{ta_proportion}"))
+          final_score = final_ta_score + final_s_score
+          work.final_score = format("%.2f",final_score.to_f)
         end
+        work.save
       end
-      if work.teaching_asistant_score.nil?
-        work.final_score = work.student_score
-      elsif work.student_score.nil?
-        work.final_score = work.teaching_asistant_score
-      else
-        homework = HomeworkCommon.find work.homework_common_id
-        ta_proportion = homework.homework_detail_manual.ta_proportion
-        final_ta_score = BigDecimal.new("#{work.teaching_asistant_score}") * BigDecimal.new("#{ta_proportion}")
-        final_s_score = BigDecimal.new("#{work.student_score}") * (BigDecimal.new('1.0')  - BigDecimal.new("#{ta_proportion}"))
-        final_score = final_ta_score + final_s_score
-        work.final_score = format("%.2f",final_score.to_f)
-      end
-      work.save
+    rescue => e
+      logger.error "[Errno::ENOENT] ===> #{e}"
     end
   end
 
diff --git a/db/migrate/20160329014316_update_one_student_teacher_score.rb b/db/migrate/20160329014316_update_one_student_teacher_score.rb
index cf56db220..cdbc9444f 100644
--- a/db/migrate/20160329014316_update_one_student_teacher_score.rb
+++ b/db/migrate/20160329014316_update_one_student_teacher_score.rb
@@ -1,15 +1,19 @@
 class UpdateOneStudentTeacherScore < ActiveRecord::Migration
   def up
-    work = StudentWork.find 49774
-    score = StudentWorksScore.new
-    score.score = 100
-    score.user_id = 7318
-    score.student_work_id = work.id
-    score.reviewer_role = 1
-    if score.save
-      work.teacher_score = score.score
+    begin
+      work = StudentWork.find 49774
+      score = StudentWorksScore.new
+      score.score = 100
+      score.user_id = 7318
+      score.student_work_id = work.id
+      score.reviewer_role = 1
+      if score.save
+        work.teacher_score = score.score
+      end
+      work.save
+    rescue => e
+      logger.error "[Errno::ENOENT] ===> #{e}"
     end
-    work.save
   end
 
   def down
diff --git a/db/migrate/20160405021915_delete_anonymous_work.rb b/db/migrate/20160405021915_delete_anonymous_work.rb
index 1677b248a..9403c4cc4 100644
--- a/db/migrate/20160405021915_delete_anonymous_work.rb
+++ b/db/migrate/20160405021915_delete_anonymous_work.rb
@@ -1,16 +1,20 @@
 class DeleteAnonymousWork < ActiveRecord::Migration
   def up
-    student_works = StudentWork.where("homework_common_id = 2882").map{|work| work.id} unless StudentWork.where("homework_common_id = 2882").empty?
-    student_work_ids = "(" + student_works.join(",") + ")"
-    student_work_scores = StudentWorksScore.where("student_work_id in #{student_work_ids}")
-    unless student_work_scores.empty?
-      student_work_scores.each do |sscore|
-      student_work = StudentWork.find sscore.student_work_id
-      student_work.student_score = 0 unless student_work.nil?
-      student_work.absence_penalty = 0
-      sscore.destroy
-      student_work.save
+    begin
+      student_works = StudentWork.where("homework_common_id = 2882").map{|work| work.id} unless StudentWork.where("homework_common_id = 2882").empty?
+      student_work_ids = "(" + student_works.join(",") + ")"
+      student_work_scores = StudentWorksScore.where("student_work_id in #{student_work_ids}")
+      unless student_work_scores.empty?
+        student_work_scores.each do |sscore|
+          student_work = StudentWork.find sscore.student_work_id
+          student_work.student_score = 0 unless student_work.nil?
+          student_work.absence_penalty = 0
+          sscore.destroy
+          student_work.save
+        end
       end
+    rescue => e
+      logger.error "[Errno::ENOENT] ===> #{e}"
     end
   end