diff --git a/modules/customer/includes/commerce_customer_profile.controller.inc b/modules/customer/includes/commerce_customer_profile.controller.inc
index 88fc6eb..875aba4 100644
--- a/modules/customer/includes/commerce_customer_profile.controller.inc
+++ b/modules/customer/includes/commerce_customer_profile.controller.inc
@@ -22,8 +22,8 @@ class CommerceCustomerProfileEntityController extends DrupalCommerceEntityContro
    */
   public function create(array $values = array()) {
     $values += array(
-      'profile_id' => '',
-      'revision_id' => '',
+      'profile_id' => NULL,
+      'revision_id' => NULL,
       'type' => '',
       'uid' => 0,
       'status' => 1,
diff --git a/modules/line_item/includes/commerce_line_item.controller.inc b/modules/line_item/includes/commerce_line_item.controller.inc
index 99e6a79..b982c9d 100644
--- a/modules/line_item/includes/commerce_line_item.controller.inc
+++ b/modules/line_item/includes/commerce_line_item.controller.inc
@@ -22,7 +22,7 @@ class CommerceLineItemEntityController extends DrupalCommerceEntityController {
    */
   public function create(array $values = array()) {
     $values += array(
-      'line_item_id' => '',
+      'line_item_id' => NULL,
       'order_id' => 0,
       'type' => '',
       'line_item_label' => '',
diff --git a/modules/payment/includes/commerce_payment_transaction.controller.inc b/modules/payment/includes/commerce_payment_transaction.controller.inc
index 1538c52..120c67a 100644
--- a/modules/payment/includes/commerce_payment_transaction.controller.inc
+++ b/modules/payment/includes/commerce_payment_transaction.controller.inc
@@ -25,8 +25,8 @@ class CommercePaymentTransactionEntityController extends DrupalCommerceEntityCon
     global $user;
 
     $values += array(
-      'transaction_id' => '',
-      'revision_id' => '',
+      'transaction_id' => NULL,
+      'revision_id' => NULL,
       'uid' => $user->uid,
       'order_id' => 0,
       'payment_method' => '',
diff --git a/modules/product/includes/commerce_product.controller.inc b/modules/product/includes/commerce_product.controller.inc
index 316444b..50af68e 100644
--- a/modules/product/includes/commerce_product.controller.inc
+++ b/modules/product/includes/commerce_product.controller.inc
@@ -23,7 +23,7 @@ class CommerceProductEntityController extends DrupalCommerceEntityController {
    */
   public function create(array $values = array()) {
     $values += array(
-      'product_id' => '',
+      'product_id' => NULL,
       'is_new' => TRUE,
       'sku' => '',
       'revision_id' => NULL,