diff --git a/app/controllers/managements_controller.rb b/app/controllers/managements_controller.rb
index 53eb23ae..d4e08240 100644
--- a/app/controllers/managements_controller.rb
+++ b/app/controllers/managements_controller.rb
@@ -1416,7 +1416,8 @@ end
   def update_depart_identifier
     if params[:depart] && params[:identifier]
       @department = Department.where(:id => params[:depart]).first
-      @department.update_attributes(:identifier => params[:identifier]) if @department.present?
+      identifier = params[:identifier].strip.blank? ? nil : params[:identifier].strip
+      @department.update_attributes(:identifier => identifier) if @department.present?
     end
   end