diff --git a/database/migrations/2018_07_28_023826_create_checkout_acceptances_table.php b/database/migrations/2018_07_28_023826_create_checkout_acceptances_table.php
index 67bc3b800a..8a8d32fcfa 100644
--- a/database/migrations/2018_07_28_023826_create_checkout_acceptances_table.php
+++ b/database/migrations/2018_07_28_023826_create_checkout_acceptances_table.php
@@ -17,7 +17,7 @@ class CreateCheckoutAcceptancesTable extends Migration
             $table->increments('id');
 
             $table->morphs('checkoutable');
-            $table->integer('assigned_to_id')->unsigned();
+            $table->integer('assigned_to_id')->nullable();
 
             $table->string('signature_filename')->nullable();