diff --git a/app/helpers/export_helper.rb b/app/helpers/export_helper.rb
index 69e4f7302..4bc86ad29 100644
--- a/app/helpers/export_helper.rb
+++ b/app/helpers/export_helper.rb
@@ -177,7 +177,7 @@ module ExportHelper
         row_cells_column = [w_1,w_2,w_3,w_3_1,w_4,w_5,w_6,w_7,w_8,w_9,w_10,w_11,w_12,w_13,w_14,w_15,w_16,w_17,w_18]
 
         # 关卡评语
-        shixun.challenges.pluck(:id) do |challenge_id|
+        shixun.challenges.pluck(:id).each do |challenge_id|
           challenge_comment = w.shixun_work_comments.select{|comment| comment.challenge_id == challenge_id}.first
           row_cells_column << challenge_comment ? "学生可见：\n #{challenge_comment.comment.to_s} \n\n  老师可见：\n#{challenge_comment.hidden_comment.to_s}" : "--"
         end