diff --git a/app/controllers/homework_commons_controller.rb b/app/controllers/homework_commons_controller.rb
index 4685c9f69..8e4b888a1 100644
--- a/app/controllers/homework_commons_controller.rb
+++ b/app/controllers/homework_commons_controller.rb
@@ -196,7 +196,7 @@ class HomeworkCommonsController < ApplicationController
       if params[:format] == "xlsx"
         if @user_course_identity >= Course::STUDENT
           tip_exception(403, "无权限操作")
-        elsif @work_excel.size == 0
+        elsif @work_excel.blank? || @work_excel.size == 0
           normal_status(-1,"暂无用户提交！")
         else
           respond_to do |format|