diff --git a/src/Symfony/Component/Cache/Traits/AbstractTrait.php b/src/Symfony/Component/Cache/Traits/AbstractTrait.php
index 04660dcab9698..a2914fa3578b6 100644
--- a/src/Symfony/Component/Cache/Traits/AbstractTrait.php
+++ b/src/Symfony/Component/Cache/Traits/AbstractTrait.php
@@ -119,13 +119,16 @@ public function clear(/*string $prefix = ''*/)
                 }
             }
             $namespaceToClear = $this->namespace.$namespaceVersionToClear;
-            $namespaceVersion = strtr(substr_replace(base64_encode(pack('V', mt_rand())), static::NS_SEPARATOR, 5), '/', '_');
+            $namespaceVersion = self::formatNamespaceVersion(mt_rand());
             try {
-                $cleared = $this->doSave([static::NS_SEPARATOR.$this->namespace => $namespaceVersion], 0);
+                $e = $this->doSave([static::NS_SEPARATOR.$this->namespace => $namespaceVersion], 0);
             } catch (\Exception $e) {
-                $cleared = false;
             }
-            if ($cleared = true === $cleared || [] === $cleared) {
+            if (true !== $e && [] !== $e) {
+                $cleared = false;
+                $message = 'Failed to save the new namespace'.($e instanceof \Exception ? ': '.$e->getMessage() : '.');
+                CacheItem::log($this->logger, $message, ['exception' => $e instanceof \Exception ? $e : null]);
+            } else {
                 $this->namespaceVersion = $namespaceVersion;
                 $this->ids = [];
             }
@@ -267,12 +270,17 @@ private function getId($key): string
                 foreach ($this->doFetch([static::NS_SEPARATOR.$this->namespace]) as $v) {
                     $this->namespaceVersion = $v;
                 }
+                $e = true;
                 if ('1'.static::NS_SEPARATOR === $this->namespaceVersion) {
-                    $this->namespaceVersion = strtr(substr_replace(base64_encode(pack('V', time())), static::NS_SEPARATOR, 5), '/', '_');
-                    $this->doSave([static::NS_SEPARATOR.$this->namespace => $this->namespaceVersion], 0);
+                    $this->namespaceVersion = self::formatNamespaceVersion(time());
+                    $e = $this->doSave([static::NS_SEPARATOR.$this->namespace => $this->namespaceVersion], 0);
                 }
             } catch (\Exception $e) {
             }
+            if (true !== $e && [] !== $e) {
+                $message = 'Failed to save the new namespace'.($e instanceof \Exception ? ': '.$e->getMessage() : '.');
+                CacheItem::log($this->logger, $message, ['exception' => $e instanceof \Exception ? $e : null]);
+            }
         }
 
         if (\is_string($key) && isset($this->ids[$key])) {
@@ -304,4 +312,9 @@ public static function handleUnserializeCallback($class)
     {
         throw new \DomainException('Class not found: '.$class);
     }
+
+    private static function formatNamespaceVersion(int $value): string
+    {
+        return strtr(substr_replace(base64_encode(pack('V', $value)), static::NS_SEPARATOR, 5), '/', '_');
+    }
 }