diff --git a/core/lib/Drupal/Core/Cache/BackendChain.php b/core/lib/Drupal/Core/Cache/BackendChain.php
index 16136df..e8f6744 100644
--- a/core/lib/Drupal/Core/Cache/BackendChain.php
+++ b/core/lib/Drupal/Core/Cache/BackendChain.php
@@ -130,7 +130,7 @@ public function set($cid, $data, $expire = CacheBackendInterface::CACHE_PERMANEN
   }
 
   /**
-   * Implements Drupal\Core\Cache\CacheBackendInterface::setMultiple().
+   * Implements \Drupal\Core\Cache\CacheBackendInterface::setMultiple().
    */
   public function setMultiple(array $items) {
     foreach ($this->backends as $backend) {
diff --git a/core/lib/Drupal/Core/Cache/CacheBackendInterface.php b/core/lib/Drupal/Core/Cache/CacheBackendInterface.php
index 59b62db..440de17 100644
--- a/core/lib/Drupal/Core/Cache/CacheBackendInterface.php
+++ b/core/lib/Drupal/Core/Cache/CacheBackendInterface.php
@@ -163,7 +163,7 @@ public function set($cid, $data, $expire = CacheBackendInterface::CACHE_PERMANEN
    *   );
    *   @endcode
    */
-  function setMultiple(array $items);
+  public function setMultiple(array $items);
 
   /**
    * Deletes an item from the cache.
diff --git a/core/lib/Drupal/Core/Cache/DatabaseBackend.php b/core/lib/Drupal/Core/Cache/DatabaseBackend.php
index 98c47db..51a79b0 100644
--- a/core/lib/Drupal/Core/Cache/DatabaseBackend.php
+++ b/core/lib/Drupal/Core/Cache/DatabaseBackend.php
@@ -149,32 +149,31 @@ public function set($cid, $data, $expire = CacheBackendInterface::CACHE_PERMANEN
   }
 
   /**
-   * Implements Drupal\Core\Cache\CacheBackendInterface::setMultiple().
+   * Implements \Drupal\Core\Cache\CacheBackendInterface::setMultiple().
    */
   function setMultiple(array $items) {
-    try {
-      $this->deleteMultiple(array_keys($items));
-      $query = Database::getConnection()->insert($this->bin)->fields(array('cid', 'data', 'expire', 'created', 'serialized', 'tags', 'checksum_invalidations', 'checksum_deletions'));
-      foreach ($items as $cid => $item) {
-        $flat_tags = $this->flattenTags(isset($item['tags']) ? $item['tags'] : array());
-        $checksum = $this->checksumTags($flat_tags);
-        $fields = array(
-          'cid' => $cid,
-          'data' => is_string($item['data']) ? $item['data'] : serialize($item['data']),
-          'expire' => isset($item['expire']) ? $item['expire'] : CacheBackendInterface::CACHE_PERMANENT,
-          'created' => REQUEST_TIME,
-          'serialized' => is_string($item['data']) ? 0 : 1,
-          'tags' => implode(' ', $flat_tags),
-          'checksum_invalidations' => $checksum['invalidations'],
-          'checksum_deletions' => $checksum['deletions'],
-        );
-        $query->values($fields);
-      }
-      $query->execute();
+    $this->deleteMultiple(array_keys($items));
+    $query = Database::getConnection()->insert($this->bin)->fields(array('cid', 'data', 'expire', 'created', 'serialized', 'tags', 'checksCum_invalidations', 'checksum_deletions'));
+    foreach ($items as $cid => $item) {
+      $item += array(
+        'expire' => CacheBackendInterface::CACHE_PERMANENT,
+        'tags' => array(),
+      );
+      $flat_tags = $this->flattenTags($item['tags']);
+      $checksum = $this->checksumTags($flat_tags);
+      $fields = array(
+        'cid' => $cid,
+        'data' => is_string($item['data']) ? $item['data'] : serialize($item['data']),
+        'expire' => $item['expire'],
+        'created' => REQUEST_TIME,
+        'serialized' => is_string($item['data']) ? 0 : 1,
+        'tags' => implode(' ', $flat_tags),
+        'checksum_invalidations' => $checksum['invalidations'],
+        'checksum_deletions' => $checksum['deletions'],
+      );
+      $query->values($fields);
     }
-    catch (Exception $e) {
-      // The database may not be available, so we'll ignore errors.
-     }
+    $query->execute();
   }
 
   /**
diff --git a/core/lib/Drupal/Core/Cache/MemoryBackend.php b/core/lib/Drupal/Core/Cache/MemoryBackend.php
index 8cac1be..ac998fb 100644
--- a/core/lib/Drupal/Core/Cache/MemoryBackend.php
+++ b/core/lib/Drupal/Core/Cache/MemoryBackend.php
@@ -106,7 +106,7 @@ public function set($cid, $data, $expire = CacheBackendInterface::CACHE_PERMANEN
   }
 
   /**
-   * Implements Drupal\Core\Cache\CacheBackendInterface::setMultiple().
+   * Implements \Drupal\Core\Cache\CacheBackendInterface::setMultiple().
    */
   public function setMultiple(array $items = array()) {
     foreach ($items as $cid => $item) {
diff --git a/core/lib/Drupal/Core/Cache/NullBackend.php b/core/lib/Drupal/Core/Cache/NullBackend.php
index 392b7a4..98fa600 100644
--- a/core/lib/Drupal/Core/Cache/NullBackend.php
+++ b/core/lib/Drupal/Core/Cache/NullBackend.php
@@ -48,9 +48,9 @@ public function getMultiple(&$cids, $allow_invalid = FALSE) {
   public function set($cid, $data, $expire = CacheBackendInterface::CACHE_PERMANENT, array $tags = array()) {}
 
   /**
-   * Implements Drupal\Core\Cache\CacheBackendInterface::setMultiple().
+   * Implements \Drupal\Core\Cache\CacheBackendInterface::setMultiple().
    */
-  function setMultiple(array $items = array()) {}
+  public function setMultiple(array $items = array()) {}
 
   /**
    * Implements Drupal\Core\Cache\CacheBackendInterface::delete().
diff --git a/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php b/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php
index 4b9c45a..601782a 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php
@@ -299,7 +299,7 @@ public function testGetMultiple() {
   }
 
    /**
-   * Test Drupal\Core\Cache\CacheBackendInterface::setMultiple().
+   * Tests \Drupal\Core\Cache\CacheBackendInterface::setMultiple().
    */
   public function testSetMultiple() {
     $backend = $this->getCacheBackend();