diff -u b/src/Entity/PriceList.php b/src/Entity/PriceList.php
--- b/src/Entity/PriceList.php
+++ b/src/Entity/PriceList.php
@@ -215,6 +215,8 @@
    */
   public static function postDelete(EntityStorageInterface $storage, array $entities) {
     // Delete the price list item of a deleted price list.
+    $price_list_items = [];
+
     foreach ($entities as $entity) {
       if (empty($entity->field_price_list_item)) {
         continue;