diff --git a/core/lib/Drupal/Core/Template/TwigCacheChain.php b/core/lib/Drupal/Core/Template/TwigCacheChain.php
index 3696e09..956cb6d 100644
--- a/core/lib/Drupal/Core/Template/TwigCacheChain.php
+++ b/core/lib/Drupal/Core/Template/TwigCacheChain.php
@@ -26,6 +26,7 @@ class TwigCacheChain implements \Twig_CacheInterface {
    *   The cache classes to chain.
    */
   public function __construct(array $caches) {
+    assert('Drupal\\Component\\Assertion\\Inspector::assertAllObjects($collection, \'\\Twig_CacheInterface\'');
     $this->caches = $caches;
   }
 
@@ -34,10 +35,8 @@ public function __construct(array $caches) {
    */
   public function generateKey($name, $className) {
     foreach ($this->caches as $cache) {
-      if ($cache instanceof \Twig_CacheInterface) {
-        $key = $cache->generateKey($name, $className);
-        return $key;
-      }
+      $key = $cache->generateKey($name, $className);
+      return $key;
     }
   }
 
@@ -46,10 +45,8 @@ public function generateKey($name, $className) {
    */
   public function has($key) {
     foreach ($this->caches as $cache) {
-      if ($cache instanceof \Twig_CacheInterface) {
-        if ($has = $cache->has($key)) {
-          return $has;
-        }
+      if ($has = $cache->has($key)) {
+        return $has;
       }
     }
   }
@@ -59,15 +56,13 @@ public function has($key) {
    */
   public function load($key) {
     foreach ($this->caches as $cache) {
-      if ($cache instanceof \Twig_CacheInterface) {
-        try {
-          if ($cache->has($key)) {
-            $cache->load($key);
-          }
-          return;
-        }
-        catch (\RuntimeException $e) {
+      try {
+        if ($cache->has($key)) {
+          $cache->load($key);
         }
+        return;
+      }
+      catch (\RuntimeException $e) {
       }
     }
   }
@@ -76,14 +71,12 @@ public function load($key) {
    * {@inheritdoc}
    */
   public function write($key, $content) {
+    // We want to write to all of them.
     foreach ($this->caches as $cache) {
-      if ($cache instanceof \Twig_CacheInterface) {
-        try {
-          $cache->write($key, $content);
-          return;
-        }
-        catch (\RuntimeException $e) {
-        }
+      try {
+        $cache->write($key, $content);
+      }
+      catch (\RuntimeException $e) {
       }
     }
   }
@@ -93,10 +86,8 @@ public function write($key, $content) {
    */
   public function getTimestamp($key) {
     foreach ($this->caches as $cache) {
-      if ($cache instanceof \Twig_CacheInterface) {
-        if ($timestamp = $cache->getTimestamp($key)) {
-          return $timestamp;
-        }
+      if ($timestamp = $cache->getTimestamp($key)) {
+        return $timestamp;
       }
     }
   }