diff --git a/modules/backend/database/migrations/2014_10_01_000007_Db_Backend_Add_Description_Field.php b/modules/backend/database/migrations/2014_10_01_000007_Db_Backend_Add_Description_Field.php
index eae52a347..2c82b7ff5 100644
--- a/modules/backend/database/migrations/2014_10_01_000007_Db_Backend_Add_Description_Field.php
+++ b/modules/backend/database/migrations/2014_10_01_000007_Db_Backend_Add_Description_Field.php
@@ -8,7 +8,7 @@ class DbBackendAddDescriptionField extends Migration
     public function up()
     {
         Schema::table('backend_user_groups', function (Blueprint $table) {
-            $table->string('code')->index();
+            $table->string('code')->nullable()->index();
             $table->text('description')->nullable();
             $table->boolean('is_new_user_default')->default(false);
         });