diff --git a/core/lib/Drupal/Core/Template/DebugExtension.php b/core/lib/Drupal/Core/Template/DebugExtension.php
index 91f51fd5e2..15696aebae 100644
--- a/core/lib/Drupal/Core/Template/DebugExtension.php
+++ b/core/lib/Drupal/Core/Template/DebugExtension.php
@@ -28,7 +28,7 @@ public function getFunctions(): array {
     // improve developer experience.
     // @see \Twig\Extension\DebugExtension
     // @see \Symfony\Component\VarDumper\VarDumper
-    if (class_exists($this::SYMFONY_VAR_DUMPER_CLASS)) {
+    if (class_exists(self::SYMFONY_VAR_DUMPER_CLASS)) {
       return [
         new TwigFunction('dump', [self::class, 'dump'], ['needs_context' => TRUE, 'needs_environment' => TRUE, 'is_variadic' => TRUE]),
       ];
@@ -52,14 +52,12 @@ public static function dump(Environment $env, array $context, ...$variables): vo
       return;
     }
 
-    if (class_exists(static::SYMFONY_VAR_DUMPER_CLASS)) {
+    if (class_exists(self::SYMFONY_VAR_DUMPER_CLASS)) {
       if (func_num_args() === 2) {
-        call_user_func(static::SYMFONY_VAR_DUMPER_CLASS . '::dump', $context);
+        call_user_func(self::SYMFONY_VAR_DUMPER_CLASS . '::dump', $context);
       }
       else {
-        foreach ($variables as $variable) {
-          call_user_func(static::SYMFONY_VAR_DUMPER_CLASS . '::dump', $variable);
-        }
+        array_walk($variables, self::SYMFONY_VAR_DUMPER_CLASS . '::dump');
       }
     }
     else {