diff --git a/app/code/Magento/Catalog/Block/Product/ProductList/Related.php b/app/code/Magento/Catalog/Block/Product/ProductList/Related.php
index 046596e6d5b57..ff729d33e7f65 100644
--- a/app/code/Magento/Catalog/Block/Product/ProductList/Related.php
+++ b/app/code/Magento/Catalog/Block/Product/ProductList/Related.php
@@ -126,8 +126,11 @@ public function getItems()
     public function getIdentities()
     {
         $identities = [];
-        foreach ($this->getItems() as $item) {
-            $identities = array_merge($identities, $item->getIdentities());
+        $items = $this->getItems();
+        if ( !empty( $items ) ) {
+            foreach ($items as $item) {
+                $identities = array_merge($identities, $item->getIdentities());
+            }
         }
         return $identities;
     }