diff --git a/app/api/mobile/entities/user.rb b/app/api/mobile/entities/user.rb
index 1f52ae841..9112e7ec5 100644
--- a/app/api/mobile/entities/user.rb
+++ b/app/api/mobile/entities/user.rb
@@ -15,13 +15,13 @@ module Mobile
                 when :img_url
                   url_to_avatar(u)
                 when :gender
-                  u.user_extensions.gender.nil? ? 0 : u.user_extensions.gender
+                  u.nil? || u.user_extensions.nil? || u.user_extensions.gender.nil? ? 0 : u.user_extensions.gender
                 when :work_unit
                   get_user_work_unit u
                 when :location
                   get_user_location u
                 when :brief_introduction
-                  u.user_extensions.brief_introduction
+                  u.nil? || u.user_extensions.nil? ? "" : u.user_extensions.brief_introduction
               end
             end
           end