From 960dcca3b1d692438c116ad37d7b1c864cefca3e Mon Sep 17 00:00:00 2001
From: Atish Goswami <atishgoswami@gmail.com>
Date: Sat, 2 Dec 2017 12:18:20 +0530
Subject: [PATCH] Related to PR #12466 [BACKPORT 2.3]

---
 .../Magento/Catalog/Block/Product/ListProduct.php  | 14 +++++++++++---
 .../Test/Unit/Block/Product/ListProductTest.php    |  2 +-
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/app/code/Magento/Catalog/Block/Product/ListProduct.php b/app/code/Magento/Catalog/Block/Product/ListProduct.php
index 7289aa85ea016..4a7d28c383d8b 100644
--- a/app/code/Magento/Catalog/Block/Product/ListProduct.php
+++ b/app/code/Magento/Catalog/Block/Product/ListProduct.php
@@ -265,13 +265,21 @@ public function prepareSortableFieldsByCategory($category)
     public function getIdentities()
     {
         $identities = [];
-        foreach ($this->_getProductCollection() as $item) {
-            $identities = array_merge($identities, $item->getIdentities());
-        }
+
         $category = $this->getLayer()->getCurrentCategory();
         if ($category) {
             $identities[] = Product::CACHE_PRODUCT_CATEGORY_TAG . '_' . $category->getId();
         }
+
+        //Check if category page shows only static block (No products)
+        if ($category->getData('display_mode') == Category::DM_PAGE) {
+            return $identities;
+        }
+
+        foreach ($this->_getProductCollection() as $item) {
+            $identities = array_merge($identities, $item->getIdentities());
+        }
+
         return $identities;
     }
 
diff --git a/app/code/Magento/Catalog/Test/Unit/Block/Product/ListProductTest.php b/app/code/Magento/Catalog/Test/Unit/Block/Product/ListProductTest.php
index b42357db89041..fe07f69e8046f 100644
--- a/app/code/Magento/Catalog/Test/Unit/Block/Product/ListProductTest.php
+++ b/app/code/Magento/Catalog/Test/Unit/Block/Product/ListProductTest.php
@@ -192,7 +192,7 @@ public function testGetIdentities()
             ->will($this->returnValue($this->toolbarMock));
 
         $this->assertEquals(
-            [$productTag, $categoryTag],
+            [$categoryTag, $productTag],
             $this->block->getIdentities()
         );
         $this->assertEquals(