diff --git a/core/lib/Drupal/Core/Cache/ApcuBackend.php b/core/lib/Drupal/Core/Cache/ApcuBackend.php
index 13b09d7..5fa5e1a 100644
--- a/core/lib/Drupal/Core/Cache/ApcuBackend.php
+++ b/core/lib/Drupal/Core/Cache/ApcuBackend.php
@@ -271,9 +271,12 @@ public function invalidate($cid) {
    * {@inheritdoc}
    */
   public function invalidateMultiple(array $cids) {
-    foreach (apc_fetch(array_map(array($this, 'getApcuKey'), $cids)) as $key => $cache) {
-      $cache->expire = REQUEST_TIME - 1;
-      apc_store($key, $cache, 1);
+    $result = apc_fetch(array_map(array($this, 'getApcuKey'), $cids));
+    if ($result) {
+      foreach ($result as $key => $cache) {
+        $cache->expire = REQUEST_TIME - 1;
+        apc_store($key, $cache, 1);
+      }
     }
   }
 
diff --git a/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php b/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php
index 2df1290..2a93827 100644
--- a/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php
+++ b/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php
@@ -533,10 +533,10 @@ function testDeleteTags() {
     $this->assertTrue($this->getCacheBackend($bin)->get('test_cid_invalidate1'), 'Cache items not matching tag were not invalidated.');
 
     // Test that invalid items are deleted.
-    $backend->set('test_cid_invalidate1', $this->defaultValue, Cache::PERMANENT, array('test_tag' => array(1)));
+    $backend->set('test_cid_invalidate1', $this->defaultValue, Cache::PERMANENT, array('test_tag:1'));
     $backend->invalidate('test_cid_invalidate1');
     $this->assertTrue($backend->get('test_cid_invalidate1', TRUE), 'The invalid cache item exists before deleting.');
-    $backend->deleteTags(array('test_tag' => array(1)));
+    $backend->deleteTags(array('test_tag:1'));
     $this->assertFalse($backend->get('test_cid_invalidate1', TRUE), 'The invalid cache item was deleted.');
   }
 
@@ -597,9 +597,9 @@ function testInvalidate() {
     $this->assertFalse($backend->invalidateMultiple(array()));
 
     // Test that an invalidated item is deleted with deleteTags().
-    $backend->set('test5', 5, Cache::PERMANENT, array('test_tag' => 5));
+    $backend->set('test5', 5, Cache::PERMANENT, array('test_tag:5'));
     $backend->invalidate('test5');
-    $backend->deleteTags(array('test_tag' => 5));
+    $backend->deleteTags(array('test_tag:5'));
     $this->assertFalse($backend->get('test5', TRUE));
   }
 
@@ -686,14 +686,14 @@ public function testInvalidateAll() {
     $this->assertIdentical($backend->get('test1', TRUE)->data, 1);
 
     // Test that an invalidated item is deleted with deleteTags().
-    $backend->set('test4', 4, Cache::PERMANENT, array('test_tag' => 4));
+    $backend->set('test4', 4, Cache::PERMANENT, array('test_tag:4'));
     $backend->invalidateAll();
-    $backend->deleteTags(array('test_tag' => 4));
+    $backend->deleteTags(array('test_tag:4'));
     $this->assertFalse($backend->get('test4', TRUE));
 
     // Test that a deleted item is still deleted after invalidateAll().
-    $backend->set('test5', 5, Cache::PERMANENT, array('test_tag' => 5));
-    $backend->deleteTags(array('test_tag' => 5));
+    $backend->set('test5', 5, Cache::PERMANENT, array('test_tag:5'));
+    $backend->deleteTags(array('test_tag:5'));
     $backend->invalidateAll();
     $this->assertFalse($backend->get('test5', TRUE));
   }