diff --git a/commerce_popular_products.module b/commerce_popular_products.module
index 7fcd05fefb4495eb919bf45ffaa215d9b6687045..3db59e504462d9b87b0e17da964ea57e5a6d36b2 100644
--- a/commerce_popular_products.module
+++ b/commerce_popular_products.module
@@ -186,13 +186,14 @@ function commerce_popular_products_settings_form($form, &$form_state) {
   $number = variable_get('commerce_popular_products_number', $default = '1');
   $products = variable_get('commerce_popular_products_products');
   $title = variable_get('commerce_popular_products_title', 'Popular Products This Month');
+  $product_types = commerce_popular_products_get_product_types();
   $form['block_title'] = array(
     '#type' => 'textfield',
     '#title' => t('Block title.'),
     '#description' => t('The title of the "popular products" block as shown to users.'),
     '#default_value' => $title,
   );
-  if (isset($products)) {
+  if (isset($product_types)) {
     $form['product_types'] = array(
       '#type' => 'checkboxes',
       '#title' => t('Product Types.'),