diff --git a/app/controllers/discusses_controller.rb b/app/controllers/discusses_controller.rb
index 6ddf71ba4..1b7147863 100644
--- a/app/controllers/discusses_controller.rb
+++ b/app/controllers/discusses_controller.rb
@@ -64,7 +64,7 @@ class DiscussesController < ApplicationController
     #                                       on s.id = str.shixun_id) on tr.id = str.tag_repertoire_id
     #                                       group by d.dis_id order by cnt desc) a limit 9").map{|ht| ht.attributes.dup}
     tag_id = ShixunTagRepertoire.joins(:shixun).order("myshixuns_count desc").pluck(:tag_repertoire_id).uniq.first(9)
-    @hot_tags = TagRepertoire.select([:id, :name]).where(id: tag_id).order("FIELD(id, #{tag_id.join(",")})").map{|ht| ht.attributes.dup} if tag_id
+    @hot_tags = TagRepertoire.select([:id, :name]).where(id: tag_id).order("FIELD(id, #{tag_id.join(",")})").map{|ht| ht.attributes.dup} if tag_id.present?
 
     @memos = DiscussesService.new.memo_list @memos
     @hot_memos = Memo.field_for_recommend.posts.hot.includes(:tag_repertoires).limit(4)
diff --git a/db/seeds.rb b/db/seeds.rb
index 82f2b5316..d7c2478d9 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -17,6 +17,7 @@ user_params = [
         admin: 1,
         status: 1,
         language: 'zh',
+        nickname: 'Educoder',
         show_realname: '社区导师',
         professional_certification: 1,
         certification: 1,