diff --git a/Adapter/ApcuAdapter.php b/Adapter/ApcuAdapter.php
index ddb7210..b234909 100644
--- a/Adapter/ApcuAdapter.php
+++ b/Adapter/ApcuAdapter.php
@@ -98,19 +98,10 @@ protected function doSave(array $values, int $lifetime): array|bool
             return $failed;
         }
 
-        try {
-            if (false === $failures = apcu_store($values, null, $lifetime)) {
-                $failures = $values;
-            }
-
-            return array_keys($failures);
-        } catch (\Throwable $e) {
-            if (1 === \count($values)) {
-                // Workaround https://github.com/krakjoe/apcu/issues/170
-                apcu_delete(array_key_first($values));
-            }
-
-            throw $e;
+        if (false === $failures = apcu_store($values, null, $lifetime)) {
+            $failures = $values;
         }
+
+        return array_keys($failures);
     }
 }
diff --git a/Adapter/ArrayAdapter.php b/Adapter/ArrayAdapter.php
index 7b92387..8941ae1 100644
--- a/Adapter/ArrayAdapter.php
+++ b/Adapter/ArrayAdapter.php
@@ -307,7 +307,9 @@ private function freeze($value, string $key): string|int|float|bool|array|\UnitE
             try {
                 $serialized = serialize($value);
             } catch (\Exception $e) {
-                unset($this->values[$key], $this->tags[$key]);
+                if (!isset($this->expiries[$key])) {
+                    unset($this->values[$key]);
+                }
                 $type = get_debug_type($value);
                 $message = \sprintf('Failed to save key "{key}" of type %s: %s', $type, $e->getMessage());
                 CacheItem::log($this->logger, $message, ['key' => $key, 'exception' => $e, 'cache-adapter' => get_debug_type($this)]);
diff --git a/CacheItem.php b/CacheItem.php
index ec2c0c5..4ce8e0c 100644
--- a/CacheItem.php
+++ b/CacheItem.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Cache;
 
+use Psr\Cache\CacheItemInterface;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\Cache\Exception\InvalidArgumentException;
 use Symfony\Component\Cache\Exception\LogicException;
@@ -30,7 +31,7 @@ final class CacheItem implements ItemInterface
     protected float|int|null $expiry = null;
     protected array $metadata = [];
     protected array $newMetadata = [];
-    protected ?ItemInterface $innerItem = null;
+    protected ?CacheItemInterface $innerItem = null;
     protected ?string $poolHash = null;
     protected bool $isTaggable = false;
 
diff --git a/Tests/Adapter/AdapterTestCase.php b/Tests/Adapter/AdapterTestCase.php
index da43029..031191c 100644
--- a/Tests/Adapter/AdapterTestCase.php
+++ b/Tests/Adapter/AdapterTestCase.php
@@ -350,6 +350,23 @@ public function testNumericKeysWorkAfterMemoryLeakPrevention()
 
         $this->assertEquals('value-50', $cache->getItem((string) 50)->get());
     }
+
+    public function testErrorsDontInvalidate()
+    {
+        if (isset($this->skippedTests[__FUNCTION__])) {
+            $this->markTestSkipped($this->skippedTests[__FUNCTION__]);
+        }
+
+        $cache = $this->createCachePool(0, __FUNCTION__);
+
+        $item = $cache->getItem('foo');
+        $this->assertTrue($cache->save($item->set('bar')));
+        $this->assertTrue($cache->hasItem('foo'));
+
+        $item->set(static fn () => null);
+        $this->assertFalse($cache->save($item));
+        $this->assertSame('bar', $cache->getItem('foo')->get());
+    }
 }
 
 class NotUnserializable
diff --git a/Tests/Adapter/PhpArrayAdapterTest.php b/Tests/Adapter/PhpArrayAdapterTest.php
index 5bbe4d1..ada3149 100644
--- a/Tests/Adapter/PhpArrayAdapterTest.php
+++ b/Tests/Adapter/PhpArrayAdapterTest.php
@@ -42,6 +42,7 @@ class PhpArrayAdapterTest extends AdapterTestCase
         'testSaveDeferredWhenChangingValues' => 'PhpArrayAdapter is read-only.',
         'testSaveDeferredOverwrite' => 'PhpArrayAdapter is read-only.',
         'testIsHitDeferred' => 'PhpArrayAdapter is read-only.',
+        'testErrorsDontInvalidate' => 'PhpArrayAdapter is read-only.',
 
         'testExpiresAt' => 'PhpArrayAdapter does not support expiration.',
         'testExpiresAtWithNull' => 'PhpArrayAdapter does not support expiration.',