diff --git a/app/models/poll.rb b/app/models/poll.rb
index 7f0d2fd94..9cb860f61 100644
--- a/app/models/poll.rb
+++ b/app/models/poll.rb
@@ -104,7 +104,7 @@ class Poll < ApplicationRecord
       status = 4
     else
       if user.present? && user.student_of_course?(course)
-        ex_time = get_poll_times(user_id,false)
+        ex_time = get_poll_times(user.id,false)
         pb_time = ex_time[:publish_time]
         ed_time = ex_time[:end_time]
         if pb_time.present? && ed_time.present? && pb_time <= Time.now && ed_time > Time.now
diff --git a/app/views/users/homepage_info.json.jbuilder b/app/views/users/homepage_info.json.jbuilder
index 4f8f3c446..78e0e1d7b 100644
--- a/app/views/users/homepage_info.json.jbuilder
+++ b/app/views/users/homepage_info.json.jbuilder
@@ -1,6 +1,6 @@
 json.id @user.id
 json.name @user.full_name
-json.avatar_url image_tag(url_to_avatar(@user))
+json.avatar_url image_tag("/" + url_to_avatar(@user))
 json.is_logged_user @user.logged_user?
 json.experience @user.experience
 json.grade @user.grade