diff --git a/app/controllers/ec_courses_controller.rb b/app/controllers/ec_courses_controller.rb
index 15989acc..df8c24b8 100644
--- a/app/controllers/ec_courses_controller.rb
+++ b/app/controllers/ec_courses_controller.rb
@@ -697,7 +697,7 @@ class EcCoursesController < ApplicationController
     total_rate = []
     total_arry = EcCourseStudentScore.find_by_sql("SELECT avg(score) as averge_score, ec_target_position as position,
                                           ect.weigths FROM ec_student_score_targets esst, ec_course_targets ect where
-                                          esst.ec_course_target_id=ect.id and ect.ec_course_id = #{course_id.id}
+                                          esst.ec_course_target_id=ect.id and ect.ec_course_id = #{course_id}
                                           group by ec_course_target_id")
     all_score = 0
     total_arry.try(:each) do |ta|