diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 95bc618..5377c36 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -778,8 +778,8 @@ public static function bootEnvironment() {
     }
 
     // Set the Drupal custom error handler.
-    #set_error_handler('_drupal_error_handler');
-    #set_exception_handler('_drupal_exception_handler');
+    set_error_handler('_drupal_error_handler');
+    set_exception_handler('_drupal_exception_handler');
 
     static::$isEnvironmentInitialized = TRUE;
   }