Issue #3302407: Fatal error during CSS and JS removal

src/Asset/CssCollectionOptimizer.php

@@ -3,6 +3,7 @@
 namespace Drupal\flysystem\Asset;
 
 use Drupal\Core\Asset\CssCollectionOptimizer as DrupalCssCollectionOptimizer;
+use Drupal\Core\Logger\LoggerChannelTrait;
 
 /**
  * Optimizes CSS assets.
@@ -10,6 +11,7 @@ use Drupal\Core\Asset\CssCollectionOptimizer as DrupalCssCollectionOptimizer;
 class CssCollectionOptimizer extends DrupalCssCollectionOptimizer {
 
   use SchemeExtensionTrait;
+  use LoggerChannelTrait;
 
   /**
    * {@inheritdoc}
@@ -22,7 +24,11 @@ class CssCollectionOptimizer extends DrupalCssCollectionOptimizer {
       // Default stale file threshold is 30 days (2592000 seconds).
       $stale_file_threshold = \Drupal::config('system.performance')->get('stale_file_threshold') ?? 2592000;
       if (\Drupal::time()->getRequestTime() - filemtime($uri) > $stale_file_threshold) {
-        $file_system->delete($uri);
+        try {
+          $file_system->delete($uri);
+        } catch (\Exception $e) {
+          $this->getLogger('flysystem')->error($e->getMessage());
+        }
       }
     };
     $css_dir = $this->getSchemeForExtension('css') . '://css';