diff --git a/app/models/group_user.rb b/app/models/group_user.rb
--- a/app/models/group_user.rb
+++ b/app/models/group_user.rb
@@ -1,6 +1,6 @@
 class GroupUser < ActiveRecord::Base
   self.table_name = 'groups_users'
-  
+
   belongs_to :user
   belongs_to :group
   validates_uniqueness_of :user_id, scope: :group_id, message: ->(object, data) { "'#{User.find(data[:value]).full_name}' is already in the group" }