diff --git a/db/migrate/20170403151731_create_order_queue_stations.rb b/db/migrate/20170403151731_create_order_queue_stations.rb
index 6c327b8e..801cdef0 100644
--- a/db/migrate/20170403151731_create_order_queue_stations.rb
+++ b/db/migrate/20170403151731_create_order_queue_stations.rb
@@ -3,7 +3,7 @@ class CreateOrderQueueStations < ActiveRecord::Migration[5.1]
     create_table :order_queue_stations do |t|
       t.string  :station_name, :null => false
       t.boolean :is_active, :null => false, :default => false
-      t.json    :processing_items
+      t.json    :processing_items, :default => "[]"
       t.boolean :print_copy, :null => false, :default => false
       t.string  :printer_name
       t.integer :font_size, :null => false, :default => 10