diff --git a/symfony/framework-bundle/4.2/src/Kernel.php b/symfony/framework-bundle/4.2/src/Kernel.php
index 76ebf628..ee6d7c24 100644
--- a/symfony/framework-bundle/4.2/src/Kernel.php
+++ b/symfony/framework-bundle/4.2/src/Kernel.php
@@ -31,7 +31,7 @@ class Kernel extends BaseKernel
     {
         $contents = require $this->getProjectDir().'/config/bundles.php';
         foreach ($contents as $class => $envs) {
-            if (isset($envs['all']) || isset($envs[$this->environment])) {
+            if (($envs['all'] ?? false) && ($envs[$this->environment] ?? true) || ($envs[$this->environment] ?? false)) {
                 yield new $class();
             }
         }