diff --git a/app/controllers/ec_course_evaluations_controller.rb b/app/controllers/ec_course_evaluations_controller.rb
index a144c655..2d3c2d05 100644
--- a/app/controllers/ec_course_evaluations_controller.rb
+++ b/app/controllers/ec_course_evaluations_controller.rb
@@ -169,7 +169,7 @@ class EcCourseEvaluationsController < ApplicationController
             else
               score_count = @ce.evluation_count * length
               EcStudentAchievement.where(:ec_course_evaluation_subitem_id => subitems.pluck(:id)).destroy_all
-              score_type = worksheet.cell(1, 1) == "学号" ? 1 : 2
+              score_type = worksheet.cell(1, 1) && worksheet.cell(1, 1).try(:strip) == "学号" ? 1 : 2
 
               logger.info("####evluation_count: #{@ce.evluation_count}")
               logger.info("####length: #{length}")